251133490 has 8 divisors (see below), whose sum is σ = 452040300. Its totient is φ = 100453392.

The previous prime is 251133437. The next prime is 251133497. The reversal of 251133490 is 94331152.

It can be written as a sum of positive squares in 2 ways, for example, as 247527289 + 3606201 = 15733^2 + 1899^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (251133497) 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, 12556665 + ... + 12556684.

Almost surely, 2^251133490 is an apocalyptic number.

251133490 is a deficient number, since it is larger than the sum of its proper divisors (200906810).

251133490 is a wasteful number, since it uses less digits than its factorization.

251133490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25113356.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 251133490 is about 15847.1918648068. The cubic root of 251133490 is about 630.9111616161.

The spelling of 251133490 in words is "two hundred fifty-one million, one hundred thirty-three thousand, four hundred ninety".