51402541 has 4 divisors (see below), whose sum is σ = 51607584. Its totient is φ = 51197500.

The previous prime is 51402521. The next prime is 51402551. The reversal of 51402541 is 14520415.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51402541 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, 102145 + ... + 102646.

It is an arithmetic number, because the mean of its divisors is an integer number (12901896).

Almost surely, 2^51402541 is an apocalyptic number.

It is an amenable number.

51402541 is a deficient number, since it is larger than the sum of its proper divisors (205043).

51402541 is a wasteful number, since it uses less digits than its factorization.

51402541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205042.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 51402541 is about 7169.5565413769. The cubic root of 51402541 is about 371.8161041394.

Adding to 51402541 its reverse (14520415), we get a palindrome (65922956).

The spelling of 51402541 in words is "fifty-one million, four hundred two thousand, five hundred forty-one".