51091501 has 4 divisors (see below), whose sum is σ = 51115104. Its totient is φ = 51067900.

The previous prime is 51091483. The next prime is 51091517. The reversal of 51091501 is 10519015.

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 not a de Polignac number, because 51091501 - 2⁹ = 51090989 is a prime.

It is a super-2 number, since 2×51091501² = 5220682948866002, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51095501) 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, 8185 + ... + 13006.

It is an arithmetic number, because the mean of its divisors is an integer number (12778776).

Almost surely, 2^51091501 is an apocalyptic number.

It is an amenable number.

51091501 is a deficient number, since it is larger than the sum of its proper divisors (23603).

51091501 is a wasteful number, since it uses less digits than its factorization.

51091501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23602.

The product of its (nonzero) digits is 225, while the sum is 22.

The square root of 51091501 is about 7147.8319090477. The cubic root of 51091501 is about 371.0646254903.

The spelling of 51091501 in words is "fifty-one million, ninety-one thousand, five hundred one".