51473921 has 4 divisors (see below), whose sum is σ = 51639744. Its totient is φ = 51308100.

The previous prime is 51473911. The next prime is 51473953. The reversal of 51473921 is 12937415.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51473921 - 2¹⁴ = 51457537 is a prime.

It is a super-2 number, since 2×51473921² = 5299129086228482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51473911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82445 + ... + 83066.

It is an arithmetic number, because the mean of its divisors is an integer number (12909936).

Almost surely, 2^51473921 is an apocalyptic number.

It is an amenable number.

51473921 is a deficient number, since it is larger than the sum of its proper divisors (165823).

51473921 is a wasteful number, since it uses less digits than its factorization.

51473921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165822.

The product of its digits is 7560, while the sum is 32.

The square root of 51473921 is about 7174.5328070893. The cubic root of 51473921 is about 371.9881316790.

The spelling of 51473921 in words is "fifty-one million, four hundred seventy-three thousand, nine hundred twenty-one".