61138861 has 8 divisors (see below), whose sum is σ = 69992960. Its totient is φ = 52314768.

The previous prime is 61138859. The next prime is 61138901. The reversal of 61138861 is 16883116.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61138861 - 2¹ = 61138859 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 (61138801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2946 + ... + 11443.

It is an arithmetic number, because the mean of its divisors is an integer number (8749120).

Almost surely, 2^61138861 is an apocalyptic number.

It is an amenable number.

61138861 is a deficient number, since it is larger than the sum of its proper divisors (8854099).

61138861 is a wasteful number, since it uses less digits than its factorization.

61138861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15003.

The product of its digits is 6912, while the sum is 34.

The square root of 61138861 is about 7819.1342871190. The cubic root of 61138861 is about 393.9481946368.

The spelling of 61138861 in words is "sixty-one million, one hundred thirty-eight thousand, eight hundred sixty-one".