51497655 has 16 divisors (see below), whose sum is σ = 89887104. Its totient is φ = 24968480.

The previous prime is 51497647. The next prime is 51497659. The reversal of 51497655 is 55679415.

It is not a de Polignac number, because 51497655 - 2³ = 51497647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51497659) 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, 155889 + ... + 156218.

It is an arithmetic number, because the mean of its divisors is an integer number (5617944).

Almost surely, 2^51497655 is an apocalyptic number.

51497655 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51497655 is a deficient number, since it is larger than the sum of its proper divisors (38389449).

51497655 is a wasteful number, since it uses less digits than its factorization.

51497655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312126.

The product of its digits is 189000, while the sum is 42.

The square root of 51497655 is about 7176.1866614519. The cubic root of 51497655 is about 372.0452959643.

The spelling of 51497655 in words is "fifty-one million, four hundred ninety-seven thousand, six hundred fifty-five".