1542633641 has 2 divisors, whose sum is σ = 1542633642. Its totient is φ = 1542633640.

The previous prime is 1542633629. The next prime is 1542633683. The reversal of 1542633641 is 1463362451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1483405225 + 59228416 = 38515^2 + 7696^2 .

It is a cyclic number.

It is not a de Polignac number, because 1542633641 - 2¹⁰ = 1542632617 is a prime.

It is not a weakly prime, because it can be changed into another prime (1542633611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 771316820 + 771316821.

It is an arithmetic number, because the mean of its divisors is an integer number (771316821).

Almost surely, 2^1542633641 is an apocalyptic number.

It is an amenable number.

1542633641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1542633641 is an equidigital number, since it uses as much as digits as its factorization.

1542633641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 35.

The square root of 1542633641 is about 39276.3751000522. The cubic root of 1542633641 is about 1155.4582718236.

The spelling of 1542633641 in words is "one billion, five hundred forty-two million, six hundred thirty-three thousand, six hundred forty-one".