1540998631 has 2 divisors, whose sum is σ = 1540998632. Its totient is φ = 1540998630.

The previous prime is 1540998617. The next prime is 1540998731. The reversal of 1540998631 is 1368990451.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1540998631 - 2⁹ = 1540998119 is a prime.

It is a super-2 number, since 2×1540998631² = 4749353561487748322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1540998731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770499315 + 770499316.

It is an arithmetic number, because the mean of its divisors is an integer number (770499316).

Almost surely, 2^1540998631 is an apocalyptic number.

1540998631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540998631 is an equidigital number, since it uses as much as digits as its factorization.

1540998631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 46.

The square root of 1540998631 is about 39255.5554157625. Note that the first 3 decimals coincide. The cubic root of 1540998631 is about 1155.0499109507.

The spelling of 1540998631 in words is "one billion, five hundred forty million, nine hundred ninety-eight thousand, six hundred thirty-one".