87691074213031 has 2 divisors, whose sum is σ = 87691074213032. Its totient is φ = 87691074213030.

The previous prime is 87691074212909. The next prime is 87691074213073. The reversal of 87691074213031 is 13031247019678.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87691074213031 is a prime.

It is a super-2 number, since 2×87691074213031² (a number of 29 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 87691074213031.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87691074213131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43845537106515 + 43845537106516.

It is an arithmetic number, because the mean of its divisors is an integer number (43845537106516).

Almost surely, 2^{87691074213031} is an apocalyptic number.

87691074213031 is a deficient number, since it is larger than the sum of its proper divisors (1).

87691074213031 is an equidigital number, since it uses as much as digits as its factorization.

87691074213031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1524096, while the sum is 52.

The spelling of 87691074213031 in words is "eighty-seven trillion, six hundred ninety-one billion, seventy-four million, two hundred thirteen thousand, thirty-one".