1971409863 has 16 divisors (see below), whose sum is σ = 2697069056. Its totient is φ = 1280180160.

The previous prime is 1971409859. The next prime is 1971409883. The reversal of 1971409863 is 3689041791.

It is a happy number.

It is not a de Polignac number, because 1971409863 - 2² = 1971409859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1971409823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26523 + ... + 68163.

It is an arithmetic number, because the mean of its divisors is an integer number (168566816).

Almost surely, 2^1971409863 is an apocalyptic number.

1971409863 is a deficient number, since it is larger than the sum of its proper divisors (725659193).

1971409863 is a wasteful number, since it uses less digits than its factorization.

1971409863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42054.

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 1971409863 is about 44400.5615167196. The cubic root of 1971409863 is about 1253.8886608819. Note that the first 3 decimals are identical.

The spelling of 1971409863 in words is "one billion, nine hundred seventy-one million, four hundred nine thousand, eight hundred sixty-three".