506251961 has 4 divisors (see below), whose sum is σ = 507086592. Its totient is φ = 505417332.

The previous prime is 506251957. The next prime is 506251973. The reversal of 506251961 is 169152605.

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, and also an emirpimes, since its reverse is a distinct semiprime: 169152605 = 5 ⋅33830521.

It is a cyclic number.

It is not a de Polignac number, because 506251961 - 2² = 506251957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (506251981) 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, 416405 + ... + 417618.

It is an arithmetic number, because the mean of its divisors is an integer number (126771648).

Almost surely, 2^506251961 is an apocalyptic number.

It is an amenable number.

506251961 is a deficient number, since it is larger than the sum of its proper divisors (834631).

506251961 is an equidigital number, since it uses as much as digits as its factorization.

506251961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834630.

The product of its (nonzero) digits is 16200, while the sum is 35.

The square root of 506251961 is about 22500.0435777356. The cubic root of 506251961 is about 796.9949559589.

The spelling of 506251961 in words is "five hundred six million, two hundred fifty-one thousand, nine hundred sixty-one".