51291532 has 12 divisors (see below), whose sum is σ = 91281960. Its totient is φ = 25210976.

The previous prime is 51291503. The next prime is 51291547. The reversal of 51291532 is 23519215.

It is a self number, because there is not a number n which added to its sum of digits gives 51291532.

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, 108433 + ... + 108904.

It is an arithmetic number, because the mean of its divisors is an integer number (7606830).

Almost surely, 2^51291532 is an apocalyptic number.

It is an amenable number.

51291532 is a deficient number, since it is larger than the sum of its proper divisors (39990428).

51291532 is a wasteful number, since it uses less digits than its factorization.

51291532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217400 (or 217398 counting only the distinct ones).

The product of its digits is 2700, while the sum is 28.

The square root of 51291532 is about 7161.8106649087. The cubic root of 51291532 is about 371.5482530354.

The spelling of 51291532 in words is "fifty-one million, two hundred ninety-one thousand, five hundred thirty-two".