61761691 has 4 divisors (see below), whose sum is σ = 61798792. Its totient is φ = 61724592.

The previous prime is 61761673. The next prime is 61761701. The reversal of 61761691 is 19616716.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61761691 - 2⁷ = 61761563 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 61761691.

It is not an unprimeable number, because it can be changed into a prime (61761611) 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, 15930 + ... + 19423.

It is an arithmetic number, because the mean of its divisors is an integer number (15449698).

Almost surely, 2^61761691 is an apocalyptic number.

61761691 is a deficient number, since it is larger than the sum of its proper divisors (37101).

61761691 is a wasteful number, since it uses less digits than its factorization.

61761691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37100.

The product of its digits is 13608, while the sum is 37.

The square root of 61761691 is about 7858.8606680612. The cubic root of 61761691 is about 395.2814124532.

The spelling of 61761691 in words is "sixty-one million, seven hundred sixty-one thousand, six hundred ninety-one".