51613901 has 4 divisors (see below), whose sum is σ = 51698172. Its totient is φ = 51529632.

The previous prime is 51613879. The next prime is 51613949. The reversal of 51613901 is 10931615.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 491401 + 51122500 = 701^2 + 7150^2 .

It is a cyclic number.

It is not a de Polignac number, because 51613901 - 2¹⁸ = 51351757 is a prime.

It is a super-3 number, since 3×51613901³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51613951) 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, 41210 + ... + 42443.

It is an arithmetic number, because the mean of its divisors is an integer number (12924543).

Almost surely, 2^51613901 is an apocalyptic number.

It is an amenable number.

51613901 is a deficient number, since it is larger than the sum of its proper divisors (84271).

51613901 is an equidigital number, since it uses as much as digits as its factorization.

51613901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84270.

The product of its (nonzero) digits is 810, while the sum is 26.

The square root of 51613901 is about 7184.2815228803. The cubic root of 51613901 is about 372.3250257003.

The spelling of 51613901 in words is "fifty-one million, six hundred thirteen thousand, nine hundred one".