51117207 has 8 divisors (see below), whose sum is σ = 69273840. Its totient is φ = 33519360.

The previous prime is 51117203. The next prime is 51117251. The reversal of 51117207 is 70271115.

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 51117207 - 2² = 51117203 is a prime.

It is a super-2 number, since 2×51117207² = 5225937702961698, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51117203) 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, 139482 + ... + 139847.

It is an arithmetic number, because the mean of its divisors is an integer number (8659230).

Almost surely, 2^51117207 is an apocalyptic number.

51117207 is a deficient number, since it is larger than the sum of its proper divisors (18156633).

51117207 is a wasteful number, since it uses less digits than its factorization.

51117207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279393.

The product of its (nonzero) digits is 490, while the sum is 24.

The square root of 51117207 is about 7149.6298505587. The cubic root of 51117207 is about 371.1268471109.

The spelling of 51117207 in words is "fifty-one million, one hundred seventeen thousand, two hundred seven".