1540705651 has 2 divisors, whose sum is σ = 1540705652. Its totient is φ = 1540705650.

The previous prime is 1540705643. The next prime is 1540705679. The reversal of 1540705651 is 1565070451.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1540705651 - 2³ = 1540705643 is a prime.

It is not a weakly prime, because it can be changed into another prime (1540705951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770352825 + 770352826.

It is an arithmetic number, because the mean of its divisors is an integer number (770352826).

Almost surely, 2^1540705651 is an apocalyptic number.

1540705651 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540705651 is an equidigital number, since it uses as much as digits as its factorization.

1540705651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21000, while the sum is 34.

The square root of 1540705651 is about 39251.8235372575. The cubic root of 1540705651 is about 1154.9767056139.

The spelling of 1540705651 in words is "one billion, five hundred forty million, seven hundred five thousand, six hundred fifty-one".