2251731506 has 32 divisors (see below), whose sum is σ = 3544398000. Its totient is φ = 1071465472.

The previous prime is 2251731499. The next prime is 2251731529. The reversal of 2251731506 is 6051371522.

It can be written as a sum of positive squares in 8 ways, for example, as 1706929225 + 544802281 = 41315^2 + 23341^2 .

It is a super-2 number, since 2×2251731506² = 10140589550226056072, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2627030 + ... + 2627886.

Almost surely, 2^2251731506 is an apocalyptic number.

2251731506 is a deficient number, since it is larger than the sum of its proper divisors (1292666494).

2251731506 is a wasteful number, since it uses less digits than its factorization.

2251731506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1486.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 2251731506 is about 47452.4130682519. The cubic root of 2251731506 is about 1310.7067464307.

The spelling of 2251731506 in words is "two billion, two hundred fifty-one million, seven hundred thirty-one thousand, five hundred six".