1541631491 has 2 divisors, whose sum is σ = 1541631492. Its totient is φ = 1541631490.

The previous prime is 1541631437. The next prime is 1541631523. The reversal of 1541631491 is 1941361451.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1541631491 - 2¹⁴ = 1541615107 is a prime.

It is not a weakly prime, because it can be changed into another prime (1541631691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770815745 + 770815746.

It is an arithmetic number, because the mean of its divisors is an integer number (770815746).

Almost surely, 2^1541631491 is an apocalyptic number.

1541631491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1541631491 is an equidigital number, since it uses as much as digits as its factorization.

1541631491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 35.

The square root of 1541631491 is about 39263.6153582423. The cubic root of 1541631491 is about 1155.2080086127.

The spelling of 1541631491 in words is "one billion, five hundred forty-one million, six hundred thirty-one thousand, four hundred ninety-one".