51929399 has 4 divisors (see below), whose sum is σ = 52071264. Its totient is φ = 51787536.

The previous prime is 51929393. The next prime is 51929417. The reversal of 51929399 is 99392915.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51929399 - 2¹² = 51925303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51929393) 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, 70382 + ... + 71115.

It is an arithmetic number, because the mean of its divisors is an integer number (13017816).

Almost surely, 2^51929399 is an apocalyptic number.

51929399 is a deficient number, since it is larger than the sum of its proper divisors (141865).

51929399 is a wasteful number, since it uses less digits than its factorization.

51929399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141864.

The product of its digits is 196830, while the sum is 47.

The square root of 51929399 is about 7206.2055896290. The cubic root of 51929399 is about 373.0821167259.

The spelling of 51929399 in words is "fifty-one million, nine hundred twenty-nine thousand, three hundred ninety-nine".