1552402121 has 4 divisors (see below), whose sum is σ = 1552753044. Its totient is φ = 1552051200.

The previous prime is 1552402051. The next prime is 1552402133. The reversal of 1552402121 is 1212042551.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1084977721 + 467424400 = 32939^2 + 21620^2 .

It is a cyclic number.

It is not a de Polignac number, because 1552402121 - 2³⁰ = 478660297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1552402021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168740 + ... + 177701.

It is an arithmetic number, because the mean of its divisors is an integer number (388188261).

Almost surely, 2^1552402121 is an apocalyptic number.

It is an amenable number.

1552402121 is a deficient number, since it is larger than the sum of its proper divisors (350923).

1552402121 is an equidigital number, since it uses as much as digits as its factorization.

1552402121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350922.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 1552402121 is about 39400.5345268310. The cubic root of 1552402121 is about 1157.8920598727.

Adding to 1552402121 its reverse (1212042551), we get a palindrome (2764444672).

The spelling of 1552402121 in words is "one billion, five hundred fifty-two million, four hundred two thousand, one hundred twenty-one".