1551056061531 has 32 divisors (see below), whose sum is σ = 2149105305600. Its totient is φ = 993986058240.

The previous prime is 1551056061521. The next prime is 1551056061563. The reversal of 1551056061531 is 1351606501551.

It is not a de Polignac number, because 1551056061531 - 2²¹ = 1551053964379 is a prime.

It is a super-2 number, since 2×1551056061531² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1551056061531.

It is not an unprimeable number, because it can be changed into a prime (1551056061521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11272315 + ... + 11409083.

It is an arithmetic number, because the mean of its divisors is an integer number (67159540800).

Almost surely, 2^{1551056061531} is an apocalyptic number.

1551056061531 is a deficient number, since it is larger than the sum of its proper divisors (598049244069).

1551056061531 is a wasteful number, since it uses less digits than its factorization.

1551056061531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137619.

The product of its (nonzero) digits is 67500, while the sum is 39.

The spelling of 1551056061531 in words is "one trillion, five hundred fifty-one billion, fifty-six million, sixty-one thousand, five hundred thirty-one".