87961537 has 2 divisors, whose sum is σ = 87961538. Its totient is φ = 87961536.

The previous prime is 87961529. The next prime is 87961547. The reversal of 87961537 is 73516978.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80568576 + 7392961 = 8976^2 + 2719^2 .

It is a cyclic number.

It is not a de Polignac number, because 87961537 - 2³ = 87961529 is a prime.

It is not a weakly prime, because it can be changed into another prime (87961547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43980768 + 43980769.

It is an arithmetic number, because the mean of its divisors is an integer number (43980769).

Almost surely, 2^87961537 is an apocalyptic number.

It is an amenable number.

87961537 is a deficient number, since it is larger than the sum of its proper divisors (1).

87961537 is an equidigital number, since it uses as much as digits as its factorization.

87961537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 317520, while the sum is 46.

The square root of 87961537 is about 9378.7812107971. The cubic root of 87961537 is about 444.7312049230.

The spelling of 87961537 in words is "eighty-seven million, nine hundred sixty-one thousand, five hundred thirty-seven".