61739749 has 4 divisors (see below), whose sum is σ = 62316864. Its totient is φ = 61162636.

The previous prime is 61739737. The next prime is 61739761. The reversal of 61739749 is 94793716.

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 an interprime number because it is at equal distance from previous prime (61739737) and next prime (61739761).

It is a cyclic number.

It is not a de Polignac number, because 61739749 - 2²³ = 53351141 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61739699 and 61739708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61739719) 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, 288397 + ... + 288610.

It is an arithmetic number, because the mean of its divisors is an integer number (15579216).

Almost surely, 2^61739749 is an apocalyptic number.

It is an amenable number.

61739749 is a deficient number, since it is larger than the sum of its proper divisors (577115).

61739749 is a wasteful number, since it uses less digits than its factorization.

61739749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577114.

The product of its digits is 285768, while the sum is 46.

The square root of 61739749 is about 7857.4645401682. The cubic root of 61739749 is about 395.2345965283.

The spelling of 61739749 in words is "sixty-one million, seven hundred thirty-nine thousand, seven hundred forty-nine".