51123977 has 4 divisors (see below), whose sum is σ = 51526656. Its totient is φ = 50721300.

The previous prime is 51123971. The next prime is 51123979. The reversal of 51123977 is 77932115.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 77932115 = 5 ⋅15586423.

It is a cyclic number.

It is not a de Polignac number, because 51123977 - 2²⁰ = 50075401 is a prime.

It is a super-2 number, since 2×51123977² = 5227322048593058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51123971) 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, 201149 + ... + 201402.

It is an arithmetic number, because the mean of its divisors is an integer number (12881664).

Almost surely, 2^51123977 is an apocalyptic number.

It is an amenable number.

51123977 is a deficient number, since it is larger than the sum of its proper divisors (402679).

51123977 is a wasteful number, since it uses less digits than its factorization.

51123977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402678.

The product of its digits is 13230, while the sum is 35.

The square root of 51123977 is about 7150.1032859673. The cubic root of 51123977 is about 371.1432304907.

The spelling of 51123977 in words is "fifty-one million, one hundred twenty-three thousand, nine hundred seventy-seven".