2156245123 has 2 divisors, whose sum is σ = 2156245124. Its totient is φ = 2156245122.

The previous prime is 2156245111. The next prime is 2156245127. The reversal of 2156245123 is 3215426512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2156245123 - 2¹³ = 2156236931 is a prime.

It is a super-2 number, since 2×2156245123² = 9298786060922570258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2156245127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078122561 + 1078122562.

It is an arithmetic number, because the mean of its divisors is an integer number (1078122562).

Almost surely, 2^2156245123 is an apocalyptic number.

2156245123 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156245123 is an equidigital number, since it uses as much as digits as its factorization.

2156245123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14400, while the sum is 31.

The square root of 2156245123 is about 46435.3865387164. The cubic root of 2156245123 is about 1291.9113390757.

The spelling of 2156245123 in words is "two billion, one hundred fifty-six million, two hundred forty-five thousand, one hundred twenty-three".