1973047561 has 9 divisors (see below), whose sum is σ = 2021956839. Its totient is φ = 1925297136.

The previous prime is 1973047547. The next prime is 1973047597. The reversal of 1973047561 is 1657403791.

The square root of 1973047561 is 44419.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1904886025 + 68161536 = 43645^2 + 8256^2 .

It is not a de Polignac number, because 1973047561 - 2⁵ = 1973047529 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1973047511) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1909501 + ... + 1910533.

It is an arithmetic number, because the mean of its divisors is an integer number (224661871).

Almost surely, 2^1973047561 is an apocalyptic number.

1973047561 is the 44419-th square number.

1973047561 is the 22210-th centered octagonal number.

It is an amenable number.

1973047561 is a deficient number, since it is larger than the sum of its proper divisors (48909278).

1973047561 is an frugal number, since it uses more digits than its factorization.

1973047561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2152 (or 1076 counting only the distinct ones).

The product of its (nonzero) digits is 158760, while the sum is 43.

The cubic root of 1973047561 is about 1254.2357766905.

The spelling of 1973047561 in words is "one billion, nine hundred seventy-three million, forty-seven thousand, five hundred sixty-one".