51212297 has 4 divisors (see below), whose sum is σ = 51290436. Its totient is φ = 51134160.

The previous prime is 51212263. The next prime is 51212299. The reversal of 51212297 is 79221215.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79221215 = 5 ⋅15844243.

It can be written as a sum of positive squares in 2 ways, for example, as 42981136 + 8231161 = 6556^2 + 2869^2 .

It is a cyclic number.

It is not a de Polignac number, because 51212297 - 2¹⁰ = 51211273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51212299) 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, 38078 + ... + 39399.

It is an arithmetic number, because the mean of its divisors is an integer number (12822609).

Almost surely, 2^51212297 is an apocalyptic number.

It is an amenable number.

51212297 is a deficient number, since it is larger than the sum of its proper divisors (78139).

51212297 is an equidigital number, since it uses as much as digits as its factorization.

51212297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78138.

The product of its digits is 2520, while the sum is 29.

The square root of 51212297 is about 7156.2767554085. The cubic root of 51212297 is about 371.3568322353.

The spelling of 51212297 in words is "fifty-one million, two hundred twelve thousand, two hundred ninety-seven".