61533779 has 2 divisors, whose sum is σ = 61533780. Its totient is φ = 61533778.

The previous prime is 61533757. The next prime is 61533833. The reversal of 61533779 is 97733516.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61533779 - 2²⁰ = 60485203 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61533709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30766889 + 30766890.

It is an arithmetic number, because the mean of its divisors is an integer number (30766890).

Almost surely, 2^61533779 is an apocalyptic number.

61533779 is a deficient number, since it is larger than the sum of its proper divisors (1).

61533779 is an equidigital number, since it uses as much as digits as its factorization.

61533779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 119070, while the sum is 41.

The square root of 61533779 is about 7844.3469454123. The cubic root of 61533779 is about 394.7945927704.

The spelling of 61533779 in words is "sixty-one million, five hundred thirty-three thousand, seven hundred seventy-nine".