1520121401 has 2 divisors, whose sum is σ = 1520121402. Its totient is φ = 1520121400.

The previous prime is 1520121347. The next prime is 1520121457. The reversal of 1520121401 is 1041210251.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1240730176 + 279391225 = 35224^2 + 16715^2 .

It is an emirp because it is prime and its reverse (1041210251) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1520121401 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1520121401.

It is not a weakly prime, because it can be changed into another prime (1520121901) 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, 760060700 + 760060701.

It is an arithmetic number, because the mean of its divisors is an integer number (760060701).

Almost surely, 2^1520121401 is an apocalyptic number.

It is an amenable number.

1520121401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1520121401 is an equidigital number, since it uses as much as digits as its factorization.

1520121401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 1520121401 is about 38988.7342831234. The cubic root of 1520121401 is about 1149.8100255817.

Adding to 1520121401 its reverse (1041210251), we get a palindrome (2561331652).

The spelling of 1520121401 in words is "one billion, five hundred twenty million, one hundred twenty-one thousand, four hundred one".