9138440751 has 8 divisors (see below), whose sum is σ = 13292277504. Its totient is φ = 5538448920.

The previous prime is 9138440737. The next prime is 9138440771. The reversal of 9138440751 is 1570448319.

It is a happy number.

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

It is not a de Polignac number, because 9138440751 - 2⁵ = 9138440719 is a prime.

It is a super-2 number, since 2×9138440751² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9138440771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138461191 + ... + 138461256.

It is an arithmetic number, because the mean of its divisors is an integer number (1661534688).

Almost surely, 2^9138440751 is an apocalyptic number.

9138440751 is a deficient number, since it is larger than the sum of its proper divisors (4153836753).

9138440751 is a wasteful number, since it uses less digits than its factorization.

9138440751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276922461.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 9138440751 is about 95595.1920914436. The cubic root of 9138440751 is about 2090.6950940743.

The spelling of 9138440751 in words is "nine billion, one hundred thirty-eight million, four hundred forty thousand, seven hundred fifty-one".