51379669 has 4 divisors (see below), whose sum is σ = 56050560. Its totient is φ = 46708780.

The previous prime is 51379651. The next prime is 51379673. The reversal of 51379669 is 96697315.

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 51379669 - 2¹⁵ = 51346901 is a prime.

It is a super-2 number, since 2×51379669² = 5279740773099122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51379649) 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, 2335429 + ... + 2335450.

It is an arithmetic number, because the mean of its divisors is an integer number (14012640).

Almost surely, 2^51379669 is an apocalyptic number.

It is an amenable number.

51379669 is a deficient number, since it is larger than the sum of its proper divisors (4670891).

51379669 is a wasteful number, since it uses less digits than its factorization.

51379669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4670890.

The product of its digits is 306180, while the sum is 46.

The square root of 51379669 is about 7167.9612861678. The cubic root of 51379669 is about 371.7609483733.

The spelling of 51379669 in words is "fifty-one million, three hundred seventy-nine thousand, six hundred sixty-nine".