2156637487 has 2 divisors, whose sum is σ = 2156637488. Its totient is φ = 2156637486.

The previous prime is 2156637421. The next prime is 2156637491. The reversal of 2156637487 is 7847366512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2156637487 - 2⁷ = 2156637359 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2156637487.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2156637407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078318743 + 1078318744.

It is an arithmetic number, because the mean of its divisors is an integer number (1078318744).

Almost surely, 2^2156637487 is an apocalyptic number.

2156637487 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156637487 is an equidigital number, since it uses as much as digits as its factorization.

2156637487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1693440, while the sum is 49.

The square root of 2156637487 is about 46439.6111848495. The cubic root of 2156637487 is about 1291.9896957758.

The spelling of 2156637487 in words is "two billion, one hundred fifty-six million, six hundred thirty-seven thousand, four hundred eighty-seven".