61579493 has 2 divisors, whose sum is σ = 61579494. Its totient is φ = 61579492.

The previous prime is 61579451. The next prime is 61579549. The reversal of 61579493 is 39497516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49308484 + 12271009 = 7022^2 + 3503^2 .

It is a cyclic number.

It is not a de Polignac number, because 61579493 - 2¹⁶ = 61513957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61579403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30789746 + 30789747.

It is an arithmetic number, because the mean of its divisors is an integer number (30789747).

Almost surely, 2^61579493 is an apocalyptic number.

It is an amenable number.

61579493 is a deficient number, since it is larger than the sum of its proper divisors (1).

61579493 is an equidigital number, since it uses as much as digits as its factorization.

61579493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 44.

The square root of 61579493 is about 7847.2602225235. The cubic root of 61579493 is about 394.8923340592.

It can be divided in two parts, 615 and 79493, that added together give a palindrome (80108).

The spelling of 61579493 in words is "sixty-one million, five hundred seventy-nine thousand, four hundred ninety-three".