1541257391 has 2 divisors, whose sum is σ = 1541257392. Its totient is φ = 1541257390.

The previous prime is 1541257387. The next prime is 1541257427. The reversal of 1541257391 is 1937521451.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1541257391 - 2² = 1541257387 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1541257321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770628695 + 770628696.

It is an arithmetic number, because the mean of its divisors is an integer number (770628696).

Almost surely, 2^1541257391 is an apocalyptic number.

1541257391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1541257391 is an equidigital number, since it uses as much as digits as its factorization.

1541257391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37800, while the sum is 38.

The square root of 1541257391 is about 39258.8511166590. The cubic root of 1541257391 is about 1155.1145582043.

The spelling of 1541257391 in words is "one billion, five hundred forty-one million, two hundred fifty-seven thousand, three hundred ninety-one".