296921681 has 4 divisors (see below), whose sum is σ = 339339072. Its totient is φ = 254504292.

The previous prime is 296921671. The next prime is 296921693. The reversal of 296921681 is 186129692.

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 296921681 - 2²² = 292727377 is a prime.

It is a super-2 number, since 2×296921681² = 176324969295731522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (296921671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21208685 + ... + 21208698.

It is an arithmetic number, because the mean of its divisors is an integer number (84834768).

Almost surely, 2^296921681 is an apocalyptic number.

It is an amenable number.

296921681 is a deficient number, since it is larger than the sum of its proper divisors (42417391).

296921681 is an equidigital number, since it uses as much as digits as its factorization.

296921681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42417390.

The product of its digits is 93312, while the sum is 44.

The square root of 296921681 is about 17231.4155251390. The cubic root of 296921681 is about 667.1353755851.

The spelling of 296921681 in words is "two hundred ninety-six million, nine hundred twenty-one thousand, six hundred eighty-one".