153561491 has 4 divisors (see below), whose sum is σ = 153587184. Its totient is φ = 153535800.

The previous prime is 153561487. The next prime is 153561497. The reversal of 153561491 is 194165351.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194165351 = 19 ⋅10219229.

It is a cyclic number.

It is not a de Polignac number, because 153561491 - 2² = 153561487 is a prime.

It is a super-2 number, since 2×153561491² = 47162263036286162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (153561497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1346 + ... + 17576.

It is an arithmetic number, because the mean of its divisors is an integer number (38396796).

Almost surely, 2^153561491 is an apocalyptic number.

153561491 is a deficient number, since it is larger than the sum of its proper divisors (25693).

153561491 is an equidigital number, since it uses as much as digits as its factorization.

153561491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25692.

The product of its digits is 16200, while the sum is 35.

The square root of 153561491 is about 12391.9930196882. The cubic root of 153561491 is about 535.5016007808.

The spelling of 153561491 in words is "one hundred fifty-three million, five hundred sixty-one thousand, four hundred ninety-one".