87971350513 has 2 divisors, whose sum is σ = 87971350514. Its totient is φ = 87971350512.

The previous prime is 87971350459. The next prime is 87971350573. The reversal of 87971350513 is 31505317978.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55798471089 + 32172879424 = 236217^2 + 179368^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87971350513 is a prime.

It is a super-2 number, since 2×87971350513² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (87971350573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43985675256 + 43985675257.

It is an arithmetic number, because the mean of its divisors is an integer number (43985675257).

Almost surely, 2^87971350513 is an apocalyptic number.

It is an amenable number.

87971350513 is a deficient number, since it is larger than the sum of its proper divisors (1).

87971350513 is an equidigital number, since it uses as much as digits as its factorization.

87971350513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 793800, while the sum is 49.

The spelling of 87971350513 in words is "eighty-seven billion, nine hundred seventy-one million, three hundred fifty thousand, five hundred thirteen".