49981815 has 24 divisors (see below), whose sum is σ = 93300480. Its totient is φ = 24606144.

The previous prime is 49981807. The next prime is 49981823. The reversal of 49981815 is 51818994.

49981815 is a `hidden beast` number, since 499 + 81 + 81 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (49981807) and next prime (49981823).

It is not a de Polignac number, because 49981815 - 2³ = 49981807 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42135 + ... + 43304.

It is an arithmetic number, because the mean of its divisors is an integer number (3887520).

Almost surely, 2^49981815 is an apocalyptic number.

49981815 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

49981815 is a deficient number, since it is larger than the sum of its proper divisors (43318665).

49981815 is a wasteful number, since it uses less digits than its factorization.

49981815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85463 (or 85460 counting only the distinct ones).

The product of its digits is 103680, while the sum is 45.

The square root of 49981815 is about 7069.7818212446. The cubic root of 49981815 is about 368.3584817065.

The spelling of 49981815 in words is "forty-nine million, nine hundred eighty-one thousand, eight hundred fifteen".