2156520019 has 2 divisors, whose sum is σ = 2156520020. Its totient is φ = 2156520018.

The previous prime is 2156519999. The next prime is 2156520029. The reversal of 2156520019 is 9100256512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2156520019 - 2⁷ = 2156519891 is a prime.

It is a super-2 number, since 2×2156520019² = 9301157184695520722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2156520029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078260009 + 1078260010.

It is an arithmetic number, because the mean of its divisors is an integer number (1078260010).

Almost surely, 2^2156520019 is an apocalyptic number.

2156520019 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156520019 is an equidigital number, since it uses as much as digits as its factorization.

2156520019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 2156520019 is about 46438.3464283560. The cubic root of 2156520019 is about 1291.9662379312.

The spelling of 2156520019 in words is "two billion, one hundred fifty-six million, five hundred twenty thousand, nineteen".