51493590 has 32 divisors (see below), whose sum is σ = 137316960. Its totient is φ = 13731552.

The previous prime is 51493583. The next prime is 51493597. The reversal of 51493590 is 9539415.

51493590 is a `hidden beast` number, since 514 + 93 + 59 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (51493583) and next prime (51493597).

It is a super-2 number, since 2×51493590² = 5303179622176200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51493597) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95089 + ... + 95628.

It is an arithmetic number, because the mean of its divisors is an integer number (4291155).

Almost surely, 2^51493590 is an apocalyptic number.

51493590 is an abundant number, since it is smaller than the sum of its proper divisors (85823370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51493590 is a wasteful number, since it uses less digits than its factorization.

51493590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190733 (or 190727 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 36.

The square root of 51493590 is about 7175.9034274438. The cubic root of 51493590 is about 372.0355064964.

The spelling of 51493590 in words is "fifty-one million, four hundred ninety-three thousand, five hundred ninety".