1501087681 has 2 divisors, whose sum is σ = 1501087682. Its totient is φ = 1501087680.

The previous prime is 1501087661. The next prime is 1501087691. The reversal of 1501087681 is 1867801051.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1483790400 + 17297281 = 38520^2 + 4159^2 .

It is a cyclic number.

It is not a de Polignac number, because 1501087681 - 2⁵ = 1501087649 is a prime.

It is a super-2 number, since 2×1501087681² = 4506528452099915522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1501087681.

It is not a weakly prime, because it can be changed into another prime (1501087661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 750543840 + 750543841.

It is an arithmetic number, because the mean of its divisors is an integer number (750543841).

Almost surely, 2^1501087681 is an apocalyptic number.

It is an amenable number.

1501087681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1501087681 is an equidigital number, since it uses as much as digits as its factorization.

1501087681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 37.

The square root of 1501087681 is about 38743.8728188084. The cubic root of 1501087681 is about 1144.9908610217.

The spelling of 1501087681 in words is "one billion, five hundred one million, eighty-seven thousand, six hundred eighty-one".