2501891537 has 2 divisors, whose sum is σ = 2501891538. Its totient is φ = 2501891536.

The previous prime is 2501891501. The next prime is 2501891543. The reversal of 2501891537 is 7351981052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1880436496 + 621455041 = 43364^2 + 24929^2 .

It is a cyclic number.

It is not a de Polignac number, because 2501891537 - 2⁶ = 2501891473 is a prime.

It is a super-2 number, since 2×2501891537² = 12518922525824444738, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2501891494 and 2501891503.

It is not a weakly prime, because it can be changed into another prime (2501891737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1250945768 + 1250945769.

It is an arithmetic number, because the mean of its divisors is an integer number (1250945769).

Almost surely, 2^2501891537 is an apocalyptic number.

It is an amenable number.

2501891537 is a deficient number, since it is larger than the sum of its proper divisors (1).

2501891537 is an equidigital number, since it uses as much as digits as its factorization.

2501891537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 41.

The square root of 2501891537 is about 50018.9117934407. The cubic root of 2501891537 is about 1357.5510167623.

The spelling of 2501891537 in words is "two billion, five hundred one million, eight hundred ninety-one thousand, five hundred thirty-seven".