51400999 has 4 divisors (see below), whose sum is σ = 55354936. Its totient is φ = 47447064.

The previous prime is 51400991. The next prime is 51401027. The reversal of 51400999 is 99900415.

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 51400999 - 2³ = 51400991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51400991) 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, 1976949 + ... + 1976974.

It is an arithmetic number, because the mean of its divisors is an integer number (13838734).

Almost surely, 2^51400999 is an apocalyptic number.

51400999 is a deficient number, since it is larger than the sum of its proper divisors (3953937).

51400999 is a wasteful number, since it uses less digits than its factorization.

51400999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3953936.

The product of its (nonzero) digits is 14580, while the sum is 37.

The square root of 51400999 is about 7169.4490025385. The cubic root of 51400999 is about 371.8123861250.

The spelling of 51400999 in words is "fifty-one million, four hundred thousand, nine hundred ninety-nine".