1520968889 has 4 divisors (see below), whose sum is σ = 1659238800. Its totient is φ = 1382698980.

The previous prime is 1520968849. The next prime is 1520968901. The reversal of 1520968889 is 9888690251.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1520968889 - 2¹⁶ = 1520903353 is a prime.

It is a super-2 number, since 2×1520968889² = 4626692722611788642, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1520968849) 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, 69134939 + ... + 69134960.

It is an arithmetic number, because the mean of its divisors is an integer number (414809700).

Almost surely, 2^1520968889 is an apocalyptic number.

It is an amenable number.

1520968889 is a deficient number, since it is larger than the sum of its proper divisors (138269911).

1520968889 is a wasteful number, since it uses less digits than its factorization.

1520968889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138269910.

The product of its (nonzero) digits is 2488320, while the sum is 56.

The square root of 1520968889 is about 38999.6011389860. The cubic root of 1520968889 is about 1150.0236640373.

The spelling of 1520968889 in words is "one billion, five hundred twenty million, nine hundred sixty-eight thousand, eight hundred eighty-nine".