51591461 has 4 divisors (see below), whose sum is σ = 53834592. Its totient is φ = 49348332.

The previous prime is 51591451. The next prime is 51591469. The reversal of 51591461 is 16419515.

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 51591461 - 2²² = 47397157 is a prime.

It is a super-2 number, since 2×51591461² = 5323357696229042, which contains 22 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 (51591469) 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, 1121531 + ... + 1121576.

It is an arithmetic number, because the mean of its divisors is an integer number (13458648).

Almost surely, 2^51591461 is an apocalyptic number.

It is an amenable number.

51591461 is a deficient number, since it is larger than the sum of its proper divisors (2243131).

51591461 is a wasteful number, since it uses less digits than its factorization.

51591461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2243130.

The product of its digits is 5400, while the sum is 32.

The square root of 51591461 is about 7182.7196102869. The cubic root of 51591461 is about 372.2710597174.

The spelling of 51591461 in words is "fifty-one million, five hundred ninety-one thousand, four hundred sixty-one".