1540611251 has 2 divisors, whose sum is σ = 1540611252. Its totient is φ = 1540611250.

The previous prime is 1540611229. The next prime is 1540611269. The reversal of 1540611251 is 1521160451.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1540611251 - 2³⁰ = 466869427 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1540611251.

It is not a weakly prime, because it can be changed into another prime (1540611211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770305625 + 770305626.

It is an arithmetic number, because the mean of its divisors is an integer number (770305626).

Almost surely, 2^1540611251 is an apocalyptic number.

1540611251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540611251 is an equidigital number, since it uses as much as digits as its factorization.

1540611251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 1540611251 is about 39250.6210269341. The cubic root of 1540611251 is about 1154.9531164168.

The spelling of 1540611251 in words is "one billion, five hundred forty million, six hundred eleven thousand, two hundred fifty-one".