30987251557 has 2 divisors, whose sum is σ = 30987251558. Its totient is φ = 30987251556.

The previous prime is 30987251531. The next prime is 30987251567. The reversal of 30987251557 is 75515278903.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28390228036 + 2597023521 = 168494^2 + 50961^2 .

It is a cyclic number.

It is not a de Polignac number, because 30987251557 - 2¹¹ = 30987249509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30987251567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15493625778 + 15493625779.

It is an arithmetic number, because the mean of its divisors is an integer number (15493625779).

Almost surely, 2^30987251557 is an apocalyptic number.

It is an amenable number.

30987251557 is a deficient number, since it is larger than the sum of its proper divisors (1).

30987251557 is an equidigital number, since it uses as much as digits as its factorization.

30987251557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2646000, while the sum is 52.

The spelling of 30987251557 in words is "thirty billion, nine hundred eighty-seven million, two hundred fifty-one thousand, five hundred fifty-seven".