70251611531 has 2 divisors, whose sum is σ = 70251611532. Its totient is φ = 70251611530.

The previous prime is 70251611509. The next prime is 70251611537. The reversal of 70251611531 is 13511615207.

It is a strong prime.

It is an emirp because it is prime and its reverse (13511615207) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70251611531 - 2¹⁴ = 70251595147 is a prime.

It is a super-2 number, since 2×70251611531² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (70251611537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35125805765 + 35125805766.

It is an arithmetic number, because the mean of its divisors is an integer number (35125805766).

Almost surely, 2^70251611531 is an apocalyptic number.

70251611531 is a deficient number, since it is larger than the sum of its proper divisors (1).

70251611531 is an equidigital number, since it uses as much as digits as its factorization.

70251611531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6300, while the sum is 32.

The spelling of 70251611531 in words is "seventy billion, two hundred fifty-one million, six hundred eleven thousand, five hundred thirty-one".