61123999 has 8 divisors (see below), whose sum is σ = 62732880. Its totient is φ = 59532096.

The previous prime is 61123987. The next prime is 61124003. The reversal of 61123999 is 99932116.

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 61123999 - 2⁹ = 61123487 is a prime.

It is a super-2 number, since 2×61123999² = 7472286507504002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61123099) 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, 3219 + ... + 11515.

It is an arithmetic number, because the mean of its divisors is an integer number (7841610).

Almost surely, 2^61123999 is an apocalyptic number.

61123999 is a deficient number, since it is larger than the sum of its proper divisors (1608881).

61123999 is a wasteful number, since it uses less digits than its factorization.

61123999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8489.

The product of its digits is 26244, while the sum is 40.

The square root of 61123999 is about 7818.1838683930. The cubic root of 61123999 is about 393.9162709554.

The spelling of 61123999 in words is "sixty-one million, one hundred twenty-three thousand, nine hundred ninety-nine".