987541657 has 2 divisors, whose sum is σ = 987541658. Its totient is φ = 987541656.

The previous prime is 987541651. The next prime is 987541693. The reversal of 987541657 is 756145789.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 816873561 + 170668096 = 28581^2 + 13064^2 .

It is a cyclic number.

It is not a de Polignac number, because 987541657 - 2²⁷ = 853323929 is a prime.

It is not a weakly prime, because it can be changed into another prime (987541651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493770828 + 493770829.

It is an arithmetic number, because the mean of its divisors is an integer number (493770829).

Almost surely, 2^987541657 is an apocalyptic number.

It is an amenable number.

987541657 is a deficient number, since it is larger than the sum of its proper divisors (1).

987541657 is an equidigital number, since it uses as much as digits as its factorization.

987541657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2116800, while the sum is 52.

The square root of 987541657 is about 31425.1755285472. The cubic root of 987541657 is about 995.8298530475.

The spelling of 987541657 in words is "nine hundred eighty-seven million, five hundred forty-one thousand, six hundred fifty-seven".