61039749 has 4 divisors (see below), whose sum is σ = 81386336. Its totient is φ = 40693164.

The previous prime is 61039739. The next prime is 61039801. The reversal of 61039749 is 94793016.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 61039749 - 2⁵ = 61039717 is a prime.

It is a super-4 number, since 4×61039749⁴ (a number of 32 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61039739) 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, 10173289 + ... + 10173294.

It is an arithmetic number, because the mean of its divisors is an integer number (20346584).

Almost surely, 2^61039749 is an apocalyptic number.

It is an amenable number.

61039749 is a deficient number, since it is larger than the sum of its proper divisors (20346587).

61039749 is a wasteful number, since it uses less digits than its factorization.

61039749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20346586.

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 61039749 is about 7812.7939304707. The cubic root of 61039749 is about 393.7352034752.

The spelling of 61039749 in words is "sixty-one million, thirty-nine thousand, seven hundred forty-nine".