51919918 has 8 divisors (see below), whose sum is σ = 80565480. Its totient is φ = 25064760.

The previous prime is 51919909. The next prime is 51919927. The reversal of 51919918 is 81991915.

It is an interprime number because it is at equal distance from previous prime (51919909) and next prime (51919927).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 447528 + ... + 447643.

It is an arithmetic number, because the mean of its divisors is an integer number (10070685).

Almost surely, 2^51919918 is an apocalyptic number.

51919918 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

51919918 is a deficient number, since it is larger than the sum of its proper divisors (28645562).

51919918 is a wasteful number, since it uses less digits than its factorization.

51919918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 895202.

The product of its digits is 29160, while the sum is 43.

The square root of 51919918 is about 7205.5477238028. The cubic root of 51919918 is about 373.0594102121.

The spelling of 51919918 in words is "fifty-one million, nine hundred nineteen thousand, nine hundred eighteen".