50129781 has 16 divisors (see below), whose sum is σ = 72112320. Its totient is φ = 30792960.

The previous prime is 50129773. The next prime is 50129789. The reversal of 50129781 is 18792105.

It is an interprime number because it is at equal distance from previous prime (50129773) and next prime (50129789).

It is not a de Polignac number, because 50129781 - 2³ = 50129773 is a prime.

It is a super-2 number, since 2×50129781² = 5025989886215922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50129789) 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, 33630 + ... + 35088.

It is an arithmetic number, because the mean of its divisors is an integer number (4507020).

Almost surely, 2^50129781 is an apocalyptic number.

It is an amenable number.

50129781 is a deficient number, since it is larger than the sum of its proper divisors (21982539).

50129781 is a wasteful number, since it uses less digits than its factorization.

50129781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2356.

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 50129781 is about 7080.2387671603. The cubic root of 50129781 is about 368.7216193421.

The spelling of 50129781 in words is "fifty million, one hundred twenty-nine thousand, seven hundred eighty-one".