61757979 has 4 divisors (see below), whose sum is σ = 82343976. Its totient is φ = 41171984.

The previous prime is 61757977. The next prime is 61757989. The reversal of 61757979 is 97975716.

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 61757979 - 2¹ = 61757977 is a prime.

It is a super-3 number, since 3×61757979³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (61757977) 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, 10292994 + ... + 10292999.

It is an arithmetic number, because the mean of its divisors is an integer number (20585994).

Almost surely, 2^61757979 is an apocalyptic number.

61757979 is a deficient number, since it is larger than the sum of its proper divisors (20585997).

61757979 is a wasteful number, since it uses less digits than its factorization.

61757979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20585996.

The product of its digits is 833490, while the sum is 51.

The square root of 61757979 is about 7858.6244979640. The cubic root of 61757979 is about 395.2734932292.

The spelling of 61757979 in words is "sixty-one million, seven hundred fifty-seven thousand, nine hundred seventy-nine".