51779461 has 2 divisors, whose sum is σ = 51779462. Its totient is φ = 51779460.

The previous prime is 51779459. The next prime is 51779479. The reversal of 51779461 is 16497715.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51624225 + 155236 = 7185^2 + 394^2 .

It is a cyclic number.

It is not a de Polignac number, because 51779461 - 2¹ = 51779459 is a prime.

It is a super-2 number, since 2×51779461² = 5362225162901042, which contains 22 as substring.

Together with 51779459, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51779261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25889730 + 25889731.

It is an arithmetic number, because the mean of its divisors is an integer number (25889731).

Almost surely, 2^51779461 is an apocalyptic number.

It is an amenable number.

51779461 is a deficient number, since it is larger than the sum of its proper divisors (1).

51779461 is an equidigital number, since it uses as much as digits as its factorization.

51779461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 40.

The square root of 51779461 is about 7195.7946746694. The cubic root of 51779461 is about 372.7226985378.

The spelling of 51779461 in words is "fifty-one million, seven hundred seventy-nine thousand, four hundred sixty-one".