61981479 has 24 divisors (see below), whose sum is σ = 102557312. Its totient is φ = 35335440.

The previous prime is 61981441. The next prime is 61981501. The reversal of 61981479 is 97418916.

It is a happy number.

It is not a de Polignac number, because 61981479 - 2⁹ = 61980967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61981079) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35112 + ... + 36834.

Almost surely, 2^61981479 is an apocalyptic number.

61981479 is a deficient number, since it is larger than the sum of its proper divisors (40575833).

61981479 is a wasteful number, since it uses less digits than its factorization.

61981479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2307 (or 2304 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 61981479 is about 7872.8317014909. The cubic root of 61981479 is about 395.7497462309.

The spelling of 61981479 in words is "sixty-one million, nine hundred eighty-one thousand, four hundred seventy-nine".