51402899 has 4 divisors (see below), whose sum is σ = 51730464. Its totient is φ = 51075336.

The previous prime is 51402881. The next prime is 51402973. The reversal of 51402899 is 99820415.

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 51402899 - 2²⁴ = 34625683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51405899) 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, 163547 + ... + 163860.

It is an arithmetic number, because the mean of its divisors is an integer number (12932616).

Almost surely, 2^51402899 is an apocalyptic number.

51402899 is a deficient number, since it is larger than the sum of its proper divisors (327565).

51402899 is a wasteful number, since it uses less digits than its factorization.

51402899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327564.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 51402899 is about 7169.5815080101. The cubic root of 51402899 is about 371.8169673254.

The spelling of 51402899 in words is "fifty-one million, four hundred two thousand, eight hundred ninety-nine".