981487957 has 2 divisors, whose sum is σ = 981487958. Its totient is φ = 981487956.

The previous prime is 981487933. The next prime is 981487961. The reversal of 981487957 is 759784189.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 576432081 + 405055876 = 24009^2 + 20126^2 .

It is a cyclic number.

It is not a de Polignac number, because 981487957 - 2²³ = 973099349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981487357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490743978 + 490743979.

It is an arithmetic number, because the mean of its divisors is an integer number (490743979).

Almost surely, 2^981487957 is an apocalyptic number.

It is an amenable number.

981487957 is a deficient number, since it is larger than the sum of its proper divisors (1).

981487957 is an equidigital number, since it uses as much as digits as its factorization.

981487957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5080320, while the sum is 58.

The square root of 981487957 is about 31328.7081923274. The cubic root of 981487957 is about 993.7908451917.

The spelling of 981487957 in words is "nine hundred eighty-one million, four hundred eighty-seven thousand, nine hundred fifty-seven".