1151631521 has 2 divisors, whose sum is σ = 1151631522. Its totient is φ = 1151631520.

The previous prime is 1151631511. The next prime is 1151631539. The reversal of 1151631521 is 1251361511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1145077921 + 6553600 = 33839^2 + 2560^2 .

It is a cyclic number.

It is not a de Polignac number, because 1151631521 - 2¹⁸ = 1151369377 is a prime.

It is not a weakly prime, because it can be changed into another prime (1151631511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 575815760 + 575815761.

It is an arithmetic number, because the mean of its divisors is an integer number (575815761).

Almost surely, 2^1151631521 is an apocalyptic number.

It is an amenable number.

1151631521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1151631521 is an equidigital number, since it uses as much as digits as its factorization.

1151631521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 900, while the sum is 26.

The square root of 1151631521 is about 33935.6968544923. The cubic root of 1151631521 is about 1048.1847763007.

The spelling of 1151631521 in words is "one billion, one hundred fifty-one million, six hundred thirty-one thousand, five hundred twenty-one".