61138123 has 4 divisors (see below), whose sum is σ = 61266240. Its totient is φ = 61010008.

The previous prime is 61138111. The next prime is 61138139. The reversal of 61138123 is 32183116.

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 61138123 - 2¹³ = 61129931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61138153) 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, 63340 + ... + 64297.

It is an arithmetic number, because the mean of its divisors is an integer number (15316560).

Almost surely, 2^61138123 is an apocalyptic number.

61138123 is a deficient number, since it is larger than the sum of its proper divisors (128117).

61138123 is a wasteful number, since it uses less digits than its factorization.

61138123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128116.

The product of its digits is 864, while the sum is 25.

The square root of 61138123 is about 7819.0870950514. The cubic root of 61138123 is about 393.9466095296.

The spelling of 61138123 in words is "sixty-one million, one hundred thirty-eight thousand, one hundred twenty-three".