51557073 has 32 divisors (see below), whose sum is σ = 75354624. Its totient is φ = 31229952.

The previous prime is 51557057. The next prime is 51557081. The reversal of 51557073 is 37075515.

It is not a de Polignac number, because 51557073 - 2⁴ = 51557057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51557873) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 328311 + ... + 328467.

It is an arithmetic number, because the mean of its divisors is an integer number (2354832).

Almost surely, 2^51557073 is an apocalyptic number.

It is an amenable number.

51557073 is a deficient number, since it is larger than the sum of its proper divisors (23797551).

51557073 is a wasteful number, since it uses less digits than its factorization.

51557073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361.

The product of its (nonzero) digits is 18375, while the sum is 33.

The square root of 51557073 is about 7180.3254104532. The cubic root of 51557073 is about 372.1883296021.

The spelling of 51557073 in words is "fifty-one million, five hundred fifty-seven thousand, seventy-three".