51403505 has 16 divisors (see below), whose sum is σ = 64575360. Its totient is φ = 39207168.

The previous prime is 51403453. The next prime is 51403511. The reversal of 51403505 is 50530415.

It is a cyclic number.

It is not a de Polignac number, because 51403505 - 2⁶ = 51403441 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50441 + ... + 51449.

It is an arithmetic number, because the mean of its divisors is an integer number (4035960).

Almost surely, 2^51403505 is an apocalyptic number.

It is an amenable number.

51403505 is a deficient number, since it is larger than the sum of its proper divisors (13171855).

51403505 is a wasteful number, since it uses less digits than its factorization.

51403505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1480.

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 51403505 is about 7169.6237697664. The cubic root of 51403505 is about 371.8184284634.

The spelling of 51403505 in words is "fifty-one million, four hundred three thousand, five hundred five".