1520631481 has 2 divisors, whose sum is σ = 1520631482. Its totient is φ = 1520631480.

The previous prime is 1520631347. The next prime is 1520631491. The reversal of 1520631481 is 1841360251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1151991481 + 368640000 = 33941^2 + 19200^2 .

It is a cyclic number.

It is not a de Polignac number, because 1520631481 - 2²⁷ = 1386413753 is a prime.

It is a super-2 number, since 2×1520631481² = 4624640202016506722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1520631491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 760315740 + 760315741.

It is an arithmetic number, because the mean of its divisors is an integer number (760315741).

Almost surely, 2^1520631481 is an apocalyptic number.

It is an amenable number.

1520631481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1520631481 is an equidigital number, since it uses as much as digits as its factorization.

1520631481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 1520631481 is about 38995.2751112234. The cubic root of 1520631481 is about 1149.9386182739.

The spelling of 1520631481 in words is "one billion, five hundred twenty million, six hundred thirty-one thousand, four hundred eighty-one".