2151948731 has 4 divisors (see below), whose sum is σ = 2221366464. Its totient is φ = 2082531000.

The previous prime is 2151948709. The next prime is 2151948737. The reversal of 2151948731 is 1378491512.

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

It is a cyclic number.

It is not a de Polignac number, because 2151948731 - 2³⁰ = 1078206907 is a prime.

It is a super-2 number, since 2×2151948731² = 9261766681705020722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2151948737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34708820 + ... + 34708881.

It is an arithmetic number, because the mean of its divisors is an integer number (555341616).

Almost surely, 2^2151948731 is an apocalyptic number.

2151948731 is a deficient number, since it is larger than the sum of its proper divisors (69417733).

2151948731 is an equidigital number, since it uses as much as digits as its factorization.

2151948731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69417732.

The product of its digits is 60480, while the sum is 41.

The square root of 2151948731 is about 46389.1014247959. The cubic root of 2151948731 is about 1291.0527093946.

The spelling of 2151948731 in words is "two billion, one hundred fifty-one million, nine hundred forty-eight thousand, seven hundred thirty-one".