1587313961 has 2 divisors, whose sum is σ = 1587313962. Its totient is φ = 1587313960.

The previous prime is 1587313957. The next prime is 1587313969. The reversal of 1587313961 is 1693137851.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1578552361 + 8761600 = 39731^2 + 2960^2 .

It is an emirp because it is prime and its reverse (1693137851) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1587313961 - 2² = 1587313957 is a prime.

It is a super-2 number, since 2×1587313961² = 5039131221571019042, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1587313969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 793656980 + 793656981.

It is an arithmetic number, because the mean of its divisors is an integer number (793656981).

Almost surely, 2^1587313961 is an apocalyptic number.

It is an amenable number.

1587313961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1587313961 is an equidigital number, since it uses as much as digits as its factorization.

1587313961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 44.

The square root of 1587313961 is about 39841.1089328598. The cubic root of 1587313961 is about 1166.5077057526.

The spelling of 1587313961 in words is "one billion, five hundred eighty-seven million, three hundred thirteen thousand, nine hundred sixty-one".