1240515641 has 2 divisors, whose sum is σ = 1240515642. Its totient is φ = 1240515640.

The previous prime is 1240515607. The next prime is 1240515659. The reversal of 1240515641 is 1465150421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1169366416 + 71149225 = 34196^2 + 8435^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1240515641 is a prime.

It is not a weakly prime, because it can be changed into another prime (1240595641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620257820 + 620257821.

It is an arithmetic number, because the mean of its divisors is an integer number (620257821).

Almost surely, 2^1240515641 is an apocalyptic number.

It is an amenable number.

1240515641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240515641 is an equidigital number, since it uses as much as digits as its factorization.

1240515641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 1240515641 is about 35220.9545725268. The cubic root of 1240515641 is about 1074.4859676211.

The spelling of 1240515641 in words is "one billion, two hundred forty million, five hundred fifteen thousand, six hundred forty-one".