51261917 has 16 divisors (see below), whose sum is σ = 61489152. Its totient is φ = 41783280.

The previous prime is 51261911. The next prime is 51261979. The reversal of 51261917 is 71916215.

It is not a de Polignac number, because 51261917 - 2¹⁴ = 51245533 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 (51261911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29918 + ... + 31584.

It is an arithmetic number, because the mean of its divisors is an integer number (3843072).

Almost surely, 2^51261917 is an apocalyptic number.

It is an amenable number.

51261917 is a deficient number, since it is larger than the sum of its proper divisors (10227235).

51261917 is a wasteful number, since it uses less digits than its factorization.

51261917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1888.

The product of its digits is 3780, while the sum is 32.

The square root of 51261917 is about 7159.7428026431. The cubic root of 51261917 is about 371.4767303785.

The spelling of 51261917 in words is "fifty-one million, two hundred sixty-one thousand, nine hundred seventeen".