2161357052531 has 8 divisors (see below), whose sum is σ = 2163857343744. Its totient is φ = 2158857376200.

The previous prime is 2161357052527. The next prime is 2161357052537. The reversal of 2161357052531 is 1352507531612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2161357052531 - 2² = 2161357052527 is a prime.

It is a super-2 number, since 2×2161357052531² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2161357052537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7076480 + ... + 7375586.

It is an arithmetic number, because the mean of its divisors is an integer number (270482167968).

Almost surely, 2^{2161357052531} is an apocalyptic number.

2161357052531 is a deficient number, since it is larger than the sum of its proper divisors (2500291213).

2161357052531 is an equidigital number, since it uses as much as digits as its factorization.

2161357052531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307441.

The product of its (nonzero) digits is 189000, while the sum is 41.

The spelling of 2161357052531 in words is "two trillion, one hundred sixty-one billion, three hundred fifty-seven million, fifty-two thousand, five hundred thirty-one".