915040649 has 2 divisors, whose sum is σ = 915040650. Its totient is φ = 915040648.

The previous prime is 915040639. The next prime is 915040723. The reversal of 915040649 is 946040519.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 776625424 + 138415225 = 27868^2 + 11765^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-915040649 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (915040639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 457520324 + 457520325.

It is an arithmetic number, because the mean of its divisors is an integer number (457520325).

Almost surely, 2^915040649 is an apocalyptic number.

It is an amenable number.

915040649 is a deficient number, since it is larger than the sum of its proper divisors (1).

915040649 is an equidigital number, since it uses as much as digits as its factorization.

915040649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 915040649 is about 30249.6388242901. The cubic root of 915040649 is about 970.8380644656.

The spelling of 915040649 in words is "nine hundred fifteen million, forty thousand, six hundred forty-nine".