306896981 has 16 divisors (see below), whose sum is σ = 335937024. Its totient is φ = 279506304.

The previous prime is 306896957. The next prime is 306896999. The reversal of 306896981 is 189698603.

It is not a de Polignac number, because 306896981 - 2¹⁸ = 306634837 is a prime.

It is a super-2 number, since 2×306896981² = 188371513893828722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (306896951) 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, 36161 + ... + 43833.

It is an arithmetic number, because the mean of its divisors is an integer number (20996064).

Almost surely, 2^306896981 is an apocalyptic number.

It is an amenable number.

306896981 is a deficient number, since it is larger than the sum of its proper divisors (29040043).

306896981 is a wasteful number, since it uses less digits than its factorization.

306896981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7780.

The product of its (nonzero) digits is 559872, while the sum is 50.

The square root of 306896981 is about 17518.4754188257. The cubic root of 306896981 is about 674.5242049832.

The spelling of 306896981 in words is "three hundred six million, eight hundred ninety-six thousand, nine hundred eighty-one".