1090251521 has 4 divisors (see below), whose sum is σ = 1147633200. Its totient is φ = 1032869844.

The previous prime is 1090251511. The next prime is 1090251523. The reversal of 1090251521 is 1251520901.

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 1090251521 - 2⁶ = 1090251457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1090251523) 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, 28690811 + ... + 28690848.

It is an arithmetic number, because the mean of its divisors is an integer number (286908300).

Almost surely, 2^1090251521 is an apocalyptic number.

It is an amenable number.

1090251521 is a deficient number, since it is larger than the sum of its proper divisors (57381679).

1090251521 is an equidigital number, since it uses as much as digits as its factorization.

1090251521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57381678.

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 1090251521 is about 33018.9569944297. The cubic root of 1090251521 is about 1029.2216197931.

The spelling of 1090251521 in words is "one billion, ninety million, two hundred fifty-one thousand, five hundred twenty-one".