51402511 has 4 divisors (see below), whose sum is σ = 52273800. Its totient is φ = 50531224.

The previous prime is 51402503. The next prime is 51402521. The reversal of 51402511 is 11520415.

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 51402511 - 2³ = 51402503 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 (51402521) 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, 435556 + ... + 435673.

It is an arithmetic number, because the mean of its divisors is an integer number (13068450).

Almost surely, 2^51402511 is an apocalyptic number.

51402511 is a deficient number, since it is larger than the sum of its proper divisors (871289).

51402511 is an equidigital number, since it uses as much as digits as its factorization.

51402511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 871288.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 51402511 is about 7169.5544491970. The cubic root of 51402511 is about 371.8160318052.

Adding to 51402511 its reverse (11520415), we get a palindrome (62922926).

The spelling of 51402511 in words is "fifty-one million, four hundred two thousand, five hundred eleven".