61493539 has 4 divisors (see below), whose sum is σ = 65110824. Its totient is φ = 57876256.

The previous prime is 61493503. The next prime is 61493561. The reversal of 61493539 is 93539416.

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 61493539 - 2¹⁵ = 61460771 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61493039) 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, 1808617 + ... + 1808650.

It is an arithmetic number, because the mean of its divisors is an integer number (16277706).

Almost surely, 2^61493539 is an apocalyptic number.

61493539 is a deficient number, since it is larger than the sum of its proper divisors (3617285).

61493539 is a wasteful number, since it uses less digits than its factorization.

61493539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3617284.

The product of its digits is 87480, while the sum is 40.

The square root of 61493539 is about 7841.7816215449. The cubic root of 61493539 is about 394.7085153945.

The spelling of 61493539 in words is "sixty-one million, four hundred ninety-three thousand, five hundred thirty-nine".