61523779 has 4 divisors (see below), whose sum is σ = 61630984. Its totient is φ = 61416576.

The previous prime is 61523771. The next prime is 61523801. The reversal of 61523779 is 97732516.

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 61523779 - 2³ = 61523771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61523771) 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, 52737 + ... + 53890.

It is an arithmetic number, because the mean of its divisors is an integer number (15407746).

Almost surely, 2^61523779 is an apocalyptic number.

61523779 is a deficient number, since it is larger than the sum of its proper divisors (107205).

61523779 is a wasteful number, since it uses less digits than its factorization.

61523779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107204.

The product of its digits is 79380, while the sum is 40.

The square root of 61523779 is about 7843.7095178238. The cubic root of 61523779 is about 394.7732052773.

The spelling of 61523779 in words is "sixty-one million, five hundred twenty-three thousand, seven hundred seventy-nine".