23161551 has 16 divisors (see below), whose sum is σ = 37152000. Its totient is φ = 12538368.

The previous prime is 23161547. The next prime is 23161559. The reversal of 23161551 is 15516132.

It is not a de Polignac number, because 23161551 - 2² = 23161547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23161559) 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, 28626 + ... + 29423.

It is an arithmetic number, because the mean of its divisors is an integer number (2322000).

Almost surely, 2^23161551 is an apocalyptic number.

23161551 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

23161551 is a deficient number, since it is larger than the sum of its proper divisors (13990449).

23161551 is a wasteful number, since it uses less digits than its factorization.

23161551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58078.

The product of its digits is 900, while the sum is 24.

The square root of 23161551 is about 4812.6449069093. The cubic root of 23161551 is about 285.0509850305.

Adding to 23161551 its reverse (15516132), we get a palindrome (38677683).

The spelling of 23161551 in words is "twenty-three million, one hundred sixty-one thousand, five hundred fifty-one".