2157346551 has 4 divisors (see below), whose sum is σ = 2876462072. Its totient is φ = 1438231032.

The previous prime is 2157346517. The next prime is 2157346579. The reversal of 2157346551 is 1556437512.

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

It is not a de Polignac number, because 2157346551 - 2⁹ = 2157346039 is a prime.

It is a super-2 number, since 2×2157346551² = 9308288282223191202, 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 (2157345551) 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, 359557756 + ... + 359557761.

It is an arithmetic number, because the mean of its divisors is an integer number (719115518).

Almost surely, 2^2157346551 is an apocalyptic number.

2157346551 is a deficient number, since it is larger than the sum of its proper divisors (719115521).

2157346551 is an equidigital number, since it uses as much as digits as its factorization.

2157346551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719115520.

The product of its digits is 126000, while the sum is 39.

The square root of 2157346551 is about 46447.2448160276. The cubic root of 2157346551 is about 1292.1312746621.

The spelling of 2157346551 in words is "two billion, one hundred fifty-seven million, three hundred forty-six thousand, five hundred fifty-one".