3149896921 has 4 divisors (see below), whose sum is σ = 3150353844. Its totient is φ = 3149440000.

The previous prime is 3149896909. The next prime is 3149896961. The reversal of 3149896921 is 1296989413.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2222085321 + 927811600 = 47139^2 + 30460^2 .

It is a cyclic number.

It is not a de Polignac number, because 3149896921 - 2⁵ = 3149896889 is a prime.

It is a super-2 number, since 2×3149896921² = 19843701225850560482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3149896961) 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, 217960 + ... + 231961.

It is an arithmetic number, because the mean of its divisors is an integer number (787588461).

Almost surely, 2^3149896921 is an apocalyptic number.

It is an amenable number.

3149896921 is a deficient number, since it is larger than the sum of its proper divisors (456923).

3149896921 is an equidigital number, since it uses as much as digits as its factorization.

3149896921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456922.

The product of its digits is 839808, while the sum is 52.

The square root of 3149896921 is about 56123.9424933780. The cubic root of 3149896921 is about 1465.8812189453.

The spelling of 3149896921 in words is "three billion, one hundred forty-nine million, eight hundred ninety-six thousand, nine hundred twenty-one".