51699469 has 4 divisors (see below), whose sum is σ = 53947296. Its totient is φ = 49451644.

The previous prime is 51699457. The next prime is 51699491. The reversal of 51699469 is 96499615.

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 51699469 - 2⁷ = 51699341 is a prime.

It is a super-2 number, since 2×51699469² = 5345670189763922, 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 (51699419) 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, 1123879 + ... + 1123924.

It is an arithmetic number, because the mean of its divisors is an integer number (13486824).

Almost surely, 2^51699469 is an apocalyptic number.

It is an amenable number.

51699469 is a deficient number, since it is larger than the sum of its proper divisors (2247827).

51699469 is a wasteful number, since it uses less digits than its factorization.

51699469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2247826.

The product of its digits is 524880, while the sum is 49.

The square root of 51699469 is about 7190.2342799105. The cubic root of 51699469 is about 372.5306648629.

The spelling of 51699469 in words is "fifty-one million, six hundred ninety-nine thousand, four hundred sixty-nine".