51499958 has 4 divisors (see below), whose sum is σ = 77249940. Its totient is φ = 25749978.

The previous prime is 51499957. The next prime is 51499963. The reversal of 51499958 is 85999415.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51499951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12874988 + ... + 12874991.

It is an arithmetic number, because the mean of its divisors is an integer number (19312485).

Almost surely, 2^51499958 is an apocalyptic number.

51499958 is a deficient number, since it is larger than the sum of its proper divisors (25749982).

51499958 is a wasteful number, since it uses less digits than its factorization.

51499958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25749981.

The product of its digits is 583200, while the sum is 50.

The square root of 51499958 is about 7176.3471209244. The cubic root of 51499958 is about 372.0508418968.

The spelling of 51499958 in words is "fifty-one million, four hundred ninety-nine thousand, nine hundred fifty-eight".