981169257 has 4 divisors (see below), whose sum is σ = 1308225680. Its totient is φ = 654112836.

The previous prime is 981169193. The next prime is 981169279. The reversal of 981169257 is 752961189.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 981169257 - 2⁶ = 981169193 is a prime.

It is a super-2 number, since 2×981169257² = 1925386221763864098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (981169457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163528207 + ... + 163528212.

It is an arithmetic number, because the mean of its divisors is an integer number (327056420).

Almost surely, 2^981169257 is an apocalyptic number.

It is an amenable number.

981169257 is a deficient number, since it is larger than the sum of its proper divisors (327056423).

981169257 is a wasteful number, since it uses less digits than its factorization.

981169257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327056422.

The product of its digits is 272160, while the sum is 48.

The square root of 981169257 is about 31323.6213902544. The cubic root of 981169257 is about 993.6832685857.

The spelling of 981169257 in words is "nine hundred eighty-one million, one hundred sixty-nine thousand, two hundred fifty-seven".