49977561 has 4 divisors (see below), whose sum is σ = 66636752. Its totient is φ = 33318372.

The previous prime is 49977559. The next prime is 49977563. The reversal of 49977561 is 16577994.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (49977559) and next prime (49977563).

It is not a de Polignac number, because 49977561 - 2¹ = 49977559 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 49977561.

It is not an unprimeable number, because it can be changed into a prime (49977563) 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, 8329591 + ... + 8329596.

It is an arithmetic number, because the mean of its divisors is an integer number (16659188).

Almost surely, 2^49977561 is an apocalyptic number.

It is an amenable number.

49977561 is a deficient number, since it is larger than the sum of its proper divisors (16659191).

49977561 is a wasteful number, since it uses less digits than its factorization.

49977561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16659190.

The product of its digits is 476280, while the sum is 48.

The square root of 49977561 is about 7069.4809569020. The cubic root of 49977561 is about 368.3480309626.

The spelling of 49977561 in words is "forty-nine million, nine hundred seventy-seven thousand, five hundred sixty-one".