51720119 has 6 divisors (see below), whose sum is σ = 56849520. Its totient is φ = 47018180.

The previous prime is 51720113. The next prime is 51720139. The reversal of 51720119 is 91102715.

It is not a de Polignac number, because 51720119 - 2²⁴ = 34942903 is a prime.

It is a super-2 number, since 2×51720119² = 5349941418748322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51720113) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 213599 + ... + 213840.

It is an arithmetic number, because the mean of its divisors is an integer number (9474920).

Almost surely, 2^51720119 is an apocalyptic number.

51720119 is a deficient number, since it is larger than the sum of its proper divisors (5129401).

51720119 is a wasteful number, since it uses less digits than its factorization.

51720119 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427461 (or 427450 counting only the distinct ones).

The product of its (nonzero) digits is 630, while the sum is 26.

The square root of 51720119 is about 7191.6701120115. The cubic root of 51720119 is about 372.5802574692.

The spelling of 51720119 in words is "fifty-one million, seven hundred twenty thousand, one hundred nineteen".