51265557 has 48 divisors (see below), whose sum is σ = 90484992. Its totient is φ = 27302400.

The previous prime is 51265517. The next prime is 51265561. The reversal of 51265557 is 75556215.

It is a happy number.

It is not a de Polignac number, because 51265557 - 2¹⁰ = 51264533 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51265517) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 161563 + ... + 161879.

It is an arithmetic number, because the mean of its divisors is an integer number (1885104).

Almost surely, 2^51265557 is an apocalyptic number.

It is an amenable number.

51265557 is a deficient number, since it is larger than the sum of its proper divisors (39219435).

51265557 is a wasteful number, since it uses less digits than its factorization.

51265557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498 (or 495 counting only the distinct ones).

The product of its digits is 52500, while the sum is 36.

The square root of 51265557 is about 7159.9969972061. The cubic root of 51265557 is about 371.4855227620.

The spelling of 51265557 in words is "fifty-one million, two hundred sixty-five thousand, five hundred fifty-seven".