15621032451 has 4 divisors (see below), whose sum is σ = 20828043272. Its totient is φ = 10414021632.

The previous prime is 15621032447. The next prime is 15621032459. The reversal of 15621032451 is 15423012651.

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

It is not a de Polignac number, because 15621032451 - 2² = 15621032447 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15621032459) 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, 2603505406 + ... + 2603505411.

It is an arithmetic number, because the mean of its divisors is an integer number (5207010818).

Almost surely, 2^15621032451 is an apocalyptic number.

15621032451 is a deficient number, since it is larger than the sum of its proper divisors (5207010821).

15621032451 is an equidigital number, since it uses as much as digits as its factorization.

15621032451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5207010820.

The product of its (nonzero) digits is 7200, while the sum is 30.

The spelling of 15621032451 in words is "fifteen billion, six hundred twenty-one million, thirty-two thousand, four hundred fifty-one".