1521117401 has 2 divisors, whose sum is σ = 1521117402. Its totient is φ = 1521117400.

The previous prime is 1521117391. The next prime is 1521117413. The reversal of 1521117401 is 1047111251.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1205131225 + 315986176 = 34715^2 + 17776^2 .

It is a cyclic number.

It is not a de Polignac number, because 1521117401 - 2⁶ = 1521117337 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1521117901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 760558700 + 760558701.

It is an arithmetic number, because the mean of its divisors is an integer number (760558701).

Almost surely, 2^1521117401 is an apocalyptic number.

It is an amenable number.

1521117401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1521117401 is an equidigital number, since it uses as much as digits as its factorization.

1521117401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 280, while the sum is 23.

The square root of 1521117401 is about 39001.5051119825. The cubic root of 1521117401 is about 1150.0610934147.

Adding to 1521117401 its reverse (1047111251), we get a palindrome (2568228652).

The spelling of 1521117401 in words is "one billion, five hundred twenty-one million, one hundred seventeen thousand, four hundred one".