916991251 has 8 divisors (see below), whose sum is σ = 1001880000. Its totient is φ = 832356840.

The previous prime is 916991249. The next prime is 916991261. The reversal of 916991251 is 152199619.

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

It is a cyclic number.

It is not a de Polignac number, because 916991251 - 2¹ = 916991249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 916991198 and 916991207.

It is not an unprimeable number, because it can be changed into a prime (916991261) 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, 56001 + ... + 70498.

It is an arithmetic number, because the mean of its divisors is an integer number (125235000).

Almost surely, 2^916991251 is an apocalyptic number.

916991251 is a deficient number, since it is larger than the sum of its proper divisors (84888749).

916991251 is a wasteful number, since it uses less digits than its factorization.

916991251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127169.

The product of its digits is 43740, while the sum is 43.

The square root of 916991251 is about 30281.8634003920. The cubic root of 916991251 is about 971.5274235097.

The spelling of 916991251 in words is "nine hundred sixteen million, nine hundred ninety-one thousand, two hundred fifty-one".