1520317961 has 2 divisors, whose sum is σ = 1520317962. Its totient is φ = 1520317960.

The previous prime is 1520317951. The next prime is 1520317987. The reversal of 1520317961 is 1697130251.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1470262336 + 50055625 = 38344^2 + 7075^2 .

It is a cyclic number.

It is not a de Polignac number, because 1520317961 - 2¹⁰ = 1520316937 is a prime.

It is a super-2 number, since 2×1520317961² = 4622733405078395042, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1520317951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 760158980 + 760158981.

It is an arithmetic number, because the mean of its divisors is an integer number (760158981).

Almost surely, 2^1520317961 is an apocalyptic number.

It is an amenable number.

1520317961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1520317961 is an equidigital number, since it uses as much as digits as its factorization.

1520317961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 1520317961 is about 38991.2549297916. The cubic root of 1520317961 is about 1149.8595823513.

The spelling of 1520317961 in words is "one billion, five hundred twenty million, three hundred seventeen thousand, nine hundred sixty-one".