1520121457 has 2 divisors, whose sum is σ = 1520121458. Its totient is φ = 1520121456.

The previous prime is 1520121401. The next prime is 1520121479. The reversal of 1520121457 is 7541210251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1290174561 + 229946896 = 35919^2 + 15164^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1520121457 is a prime.

It is not a weakly prime, because it can be changed into another prime (1520121557) 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, 760060728 + 760060729.

It is an arithmetic number, because the mean of its divisors is an integer number (760060729).

Almost surely, 2^1520121457 is an apocalyptic number.

It is an amenable number.

1520121457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1520121457 is an equidigital number, since it uses as much as digits as its factorization.

1520121457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 1520121457 is about 38988.7350012795. The cubic root of 1520121457 is about 1149.8100397010.

The spelling of 1520121457 in words is "one billion, five hundred twenty million, one hundred twenty-one thousand, four hundred fifty-seven".