1520274731 has 2 divisors, whose sum is σ = 1520274732. Its totient is φ = 1520274730.

The previous prime is 1520274727. The next prime is 1520274733. The reversal of 1520274731 is 1374720251.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1520274731 - 2² = 1520274727 is a prime.

It is a super-2 number, since 2×1520274731² = 4622470515434244722, which contains 22 as substring.

Together with 1520274733, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1520274733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 760137365 + 760137366.

It is an arithmetic number, because the mean of its divisors is an integer number (760137366).

Almost surely, 2^1520274731 is an apocalyptic number.

1520274731 is a deficient number, since it is larger than the sum of its proper divisors (1).

1520274731 is an equidigital number, since it uses as much as digits as its factorization.

1520274731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 1520274731 is about 38990.7005707771. The cubic root of 1520274731 is about 1149.8486835564.

Adding to 1520274731 its reverse (1374720251), we get a palindrome (2894994982).

The spelling of 1520274731 in words is "one billion, five hundred twenty million, two hundred seventy-four thousand, seven hundred thirty-one".