49997861 has 4 divisors (see below), whose sum is σ = 50139852. Its totient is φ = 49855872.

The previous prime is 49997821. The next prime is 49997869. The reversal of 49997861 is 16879994.

It is a happy number.

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 32273761 + 17724100 = 5681^2 + 4210^2 .

It is a cyclic number.

It is not a de Polignac number, because 49997861 - 2¹⁸ = 49735717 is a prime.

It is a super-2 number, since 2×49997861² = 4999572209150642, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49997869) 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, 70466 + ... + 71171.

It is an arithmetic number, because the mean of its divisors is an integer number (12534963).

Almost surely, 2^49997861 is an apocalyptic number.

It is an amenable number.

49997861 is a deficient number, since it is larger than the sum of its proper divisors (141991).

49997861 is a wasteful number, since it uses less digits than its factorization.

49997861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141990.

The product of its digits is 979776, while the sum is 53.

The square root of 49997861 is about 7070.9165601073. The cubic root of 49997861 is about 368.3978963602.

The spelling of 49997861 in words is "forty-nine million, nine hundred ninety-seven thousand, eight hundred sixty-one".