79749149 has 4 divisors (see below), whose sum is σ = 79767264. Its totient is φ = 79731036.

The previous prime is 79749127. The next prime is 79749151. The reversal of 79749149 is 94194797.

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, and also an emirpimes, since its reverse is a distinct semiprime: 94194797 = 61 ⋅1544177.

It is a cyclic number.

It is not a de Polignac number, because 79749149 - 2¹² = 79745053 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 79749097 and 79749106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79749169) 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, 2264 + ... + 12830.

It is an arithmetic number, because the mean of its divisors is an integer number (19941816).

Almost surely, 2^79749149 is an apocalyptic number.

It is an amenable number.

79749149 is a deficient number, since it is larger than the sum of its proper divisors (18115).

79749149 is a wasteful number, since it uses less digits than its factorization.

79749149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18114.

The product of its digits is 571536, while the sum is 50.

The square root of 79749149 is about 8930.2379027661. The cubic root of 79749149 is about 430.4360980402.

The spelling of 79749149 in words is "seventy-nine million, seven hundred forty-nine thousand, one hundred forty-nine".