1292590721 has 2 divisors, whose sum is σ = 1292590722. Its totient is φ = 1292590720.

The previous prime is 1292590687. The next prime is 1292590763. The reversal of 1292590721 is 1270952921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 979690000 + 312900721 = 31300^2 + 17689^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1292590721 is a prime.

It is not a weakly prime, because it can be changed into another prime (1292590771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 646295360 + 646295361.

It is an arithmetic number, because the mean of its divisors is an integer number (646295361).

Almost surely, 2^1292590721 is an apocalyptic number.

It is an amenable number.

1292590721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1292590721 is an equidigital number, since it uses as much as digits as its factorization.

1292590721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 38.

The square root of 1292590721 is about 35952.6177211062. The cubic root of 1292590721 is about 1089.3154866690.

The spelling of 1292590721 in words is "one billion, two hundred ninety-two million, five hundred ninety thousand, seven hundred twenty-one".