51402643 has 4 divisors (see below), whose sum is σ = 52656408. Its totient is φ = 50148880.

The previous prime is 51402641. The next prime is 51402667. The reversal of 51402643 is 34620415.

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 51402643 - 2¹ = 51402641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51402641) 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, 626821 + ... + 626902.

It is an arithmetic number, because the mean of its divisors is an integer number (13164102).

Almost surely, 2^51402643 is an apocalyptic number.

51402643 is a deficient number, since it is larger than the sum of its proper divisors (1253765).

51402643 is a wasteful number, since it uses less digits than its factorization.

51402643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1253764.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 51402643 is about 7169.5636547840. The cubic root of 51402643 is about 371.8163500755.

The spelling of 51402643 in words is "fifty-one million, four hundred two thousand, six hundred forty-three".