981481557 has 16 divisors (see below), whose sum is σ = 1513612800. Its totient is φ = 554088432.

The previous prime is 981481477. The next prime is 981481559. The reversal of 981481557 is 755184189.

It is a happy number.

It is not a de Polignac number, because 981481557 - 2⁷ = 981481429 is a prime.

It is a super-2 number, since 2×981481557² = 1926612093462288498, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981481559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 279807 + ... + 283292.

It is an arithmetic number, because the mean of its divisors is an integer number (94600800).

Almost surely, 2^981481557 is an apocalyptic number.

It is an amenable number.

981481557 is a deficient number, since it is larger than the sum of its proper divisors (532131243).

981481557 is a wasteful number, since it uses less digits than its factorization.

981481557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563192.

The product of its digits is 403200, while the sum is 48.

The square root of 981481557 is about 31328.6060494239. The cubic root of 981481557 is about 993.7886851124.

The spelling of 981481557 in words is "nine hundred eighty-one million, four hundred eighty-one thousand, five hundred fifty-seven".