50131981 has 4 divisors (see below), whose sum is σ = 51860700. Its totient is φ = 48403264.

The previous prime is 50131967. The next prime is 50131987. The reversal of 50131981 is 18913105.

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 30151081 + 19980900 = 5491^2 + 4470^2 .

It is a cyclic number.

It is not a de Polignac number, because 50131981 - 2¹⁵ = 50099213 is a prime.

It is a super-2 number, since 2×50131981² = 5026431037968722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50131987) 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, 864316 + ... + 864373.

It is an arithmetic number, because the mean of its divisors is an integer number (12965175).

Almost surely, 2^50131981 is an apocalyptic number.

It is an amenable number.

50131981 is a deficient number, since it is larger than the sum of its proper divisors (1728719).

50131981 is a wasteful number, since it uses less digits than its factorization.

50131981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1728718.

The product of its (nonzero) digits is 1080, while the sum is 28.

The square root of 50131981 is about 7080.3941274480. The cubic root of 50131981 is about 368.7270131798.

The spelling of 50131981 in words is "fifty million, one hundred thirty-one thousand, nine hundred eighty-one".