1615621252 has 24 divisors (see below), whose sum is σ = 3239570880. Its totient is φ = 690624480.

The previous prime is 1615621237. The next prime is 1615621253. The reversal of 1615621252 is 2521265161.

It is a super-2 number, since 2×1615621252² = 5220464059828095008, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1615621253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63274 + ... + 85057.

It is an arithmetic number, because the mean of its divisors is an integer number (134982120).

Almost surely, 2^1615621252 is an apocalyptic number.

It is an amenable number.

1615621252 is an abundant number, since it is smaller than the sum of its proper divisors (1623949628).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1615621252 is a wasteful number, since it uses less digits than its factorization.

1615621252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148731 (or 148729 counting only the distinct ones).

The product of its digits is 7200, while the sum is 31.

The square root of 1615621252 is about 40194.7913541046. The cubic root of 1615621252 is about 1173.4011758795.

The spelling of 1615621252 in words is "one billion, six hundred fifteen million, six hundred twenty-one thousand, two hundred fifty-two".