87242451 has 4 divisors (see below), whose sum is σ = 116323272. Its totient is φ = 58161632.

The previous prime is 87242447. The next prime is 87242461. The reversal of 87242451 is 15424278.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 87242451 - 2² = 87242447 is a prime.

It is a super-2 number, since 2×87242451² = 15222490512974802, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (87242431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14540406 + ... + 14540411.

It is an arithmetic number, because the mean of its divisors is an integer number (29080818).

Almost surely, 2^87242451 is an apocalyptic number.

87242451 is a deficient number, since it is larger than the sum of its proper divisors (29080821).

87242451 is a wasteful number, since it uses less digits than its factorization.

87242451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29080820.

The product of its digits is 17920, while the sum is 33.

The square root of 87242451 is about 9340.3667486882. The cubic root of 87242451 is about 443.5159941645.

It can be divided in two parts, 8724 and 2451, that added together give a triangular number (11175 = T₁₄₉).

The spelling of 87242451 in words is "eighty-seven million, two hundred forty-two thousand, four hundred fifty-one".