1540997951 has 2 divisors, whose sum is σ = 1540997952. Its totient is φ = 1540997950.

The previous prime is 1540997947. The next prime is 1540997959. The reversal of 1540997951 is 1597990451.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1540997951 - 2² = 1540997947 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1540997951.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1540997959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770498975 + 770498976.

It is an arithmetic number, because the mean of its divisors is an integer number (770498976).

Almost surely, 2^1540997951 is an apocalyptic number.

1540997951 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540997951 is an equidigital number, since it uses as much as digits as its factorization.

1540997951 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 510300, while the sum is 50.

The square root of 1540997951 is about 39255.5467545671. The cubic root of 1540997951 is about 1155.0497410535.

The spelling of 1540997951 in words is "one billion, five hundred forty million, nine hundred ninety-seven thousand, nine hundred fifty-one".