49991961 has 4 divisors (see below), whose sum is σ = 66655952. Its totient is φ = 33327972.

The previous prime is 49991927. The next prime is 49991993. The reversal of 49991961 is 16919994.

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.

It is not a de Polignac number, because 49991961 - 2¹⁴ = 49975577 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 49991961.

It is not an unprimeable number, because it can be changed into a prime (49991861) 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, 8331991 + ... + 8331996.

It is an arithmetic number, because the mean of its divisors is an integer number (16663988).

Almost surely, 2^49991961 is an apocalyptic number.

It is an amenable number.

49991961 is a deficient number, since it is larger than the sum of its proper divisors (16663991).

49991961 is a wasteful number, since it uses less digits than its factorization.

49991961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16663990.

The product of its digits is 157464, while the sum is 48.

The square root of 49991961 is about 7070.4993458737. The cubic root of 49991961 is about 368.3834048530.

The spelling of 49991961 in words is "forty-nine million, nine hundred ninety-one thousand, nine hundred sixty-one".