1521055651 has 8 divisors (see below), whose sum is σ = 1554449600. Its totient is φ = 1488015360.

The previous prime is 1521055633. The next prime is 1521055661. The reversal of 1521055651 is 1565501251.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1521055651 - 2¹¹ = 1521053603 is a prime.

It is a super-2 number, since 2×1521055651² = 4627220586878067602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1521055631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79710 + ... + 96931.

It is an arithmetic number, because the mean of its divisors is an integer number (194306200).

Almost surely, 2^1521055651 is an apocalyptic number.

1521055651 is a deficient number, since it is larger than the sum of its proper divisors (33393949).

1521055651 is a wasteful number, since it uses less digits than its factorization.

1521055651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176829.

The product of its (nonzero) digits is 7500, while the sum is 31.

The square root of 1521055651 is about 39000.7134678329. The cubic root of 1521055651 is about 1150.0455309005.

The spelling of 1521055651 in words is "one billion, five hundred twenty-one million, fifty-five thousand, six hundred fifty-one".