61357789 has 4 divisors (see below), whose sum is σ = 61382524. Its totient is φ = 61333056.

The previous prime is 61357739. The next prime is 61357819. The reversal of 61357789 is 98775316.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26936100 + 34421689 = 5190^2 + 5867^2 .

It is a cyclic number.

It is not a de Polignac number, because 61357789 - 2¹³ = 61349597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61357739) 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, 8172 + ... + 13765.

It is an arithmetic number, because the mean of its divisors is an integer number (15345631).

Almost surely, 2^61357789 is an apocalyptic number.

It is an amenable number.

61357789 is a deficient number, since it is larger than the sum of its proper divisors (24735).

61357789 is a wasteful number, since it uses less digits than its factorization.

61357789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24734.

The product of its digits is 317520, while the sum is 46.

The square root of 61357789 is about 7833.1212808178. The cubic root of 61357789 is about 394.4178552790.

It can be divided in two parts, 6135 and 7789, that added together give a square (13924 = 118²).

The spelling of 61357789 in words is "sixty-one million, three hundred fifty-seven thousand, seven hundred eighty-nine".