61349979 has 4 divisors (see below), whose sum is σ = 81799976. Its totient is φ = 40899984.

The previous prime is 61349971. The next prime is 61349983. The reversal of 61349979 is 97994316.

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

It is not a de Polignac number, because 61349979 - 2³ = 61349971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61349971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10224994 + ... + 10224999.

It is an arithmetic number, because the mean of its divisors is an integer number (20449994).

Almost surely, 2^61349979 is an apocalyptic number.

61349979 is a deficient number, since it is larger than the sum of its proper divisors (20449997).

61349979 is a wasteful number, since it uses less digits than its factorization.

61349979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20449996.

The product of its digits is 367416, while the sum is 48.

The square root of 61349979 is about 7832.6227408193. The cubic root of 61349979 is about 394.4011199185.

The spelling of 61349979 in words is "sixty-one million, three hundred forty-nine thousand, nine hundred seventy-nine".