2151279757493 has 4 divisors (see below), whose sum is σ = 2151403932480. Its totient is φ = 2151155582508.

The previous prime is 2151279757457. The next prime is 2151279757507. The reversal of 2151279757493 is 3947579721512.

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 a cyclic number.

It is not a de Polignac number, because 2151279757493 - 2²² = 2151275563189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151279757453) 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, 62061503 + ... + 62096156.

It is an arithmetic number, because the mean of its divisors is an integer number (537850983120).

Almost surely, 2^{2151279757493} is an apocalyptic number.

It is an amenable number.

2151279757493 is a deficient number, since it is larger than the sum of its proper divisors (124174987).

2151279757493 is a wasteful number, since it uses less digits than its factorization.

2151279757493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124174986.

The product of its digits is 33339600, while the sum is 62.

The spelling of 2151279757493 in words is "two trillion, one hundred fifty-one billion, two hundred seventy-nine million, seven hundred fifty-seven thousand, four hundred ninety-three".