61239919 has 16 divisors (see below), whose sum is σ = 68326272. Its totient is φ = 54528768.

The previous prime is 61239901. The next prime is 61240027. The reversal of 61239919 is 91993216.

It is a cyclic number.

It is not a de Polignac number, because 61239919 - 2¹⁷ = 61108847 is a prime.

It is a super-2 number, since 2×61239919² = 7500655358253122, 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 (61239119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43917 + ... + 45289.

It is an arithmetic number, because the mean of its divisors is an integer number (4270392).

Almost surely, 2^61239919 is an apocalyptic number.

61239919 is a deficient number, since it is larger than the sum of its proper divisors (7086353).

61239919 is a wasteful number, since it uses less digits than its factorization.

61239919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1506.

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

The square root of 61239919 is about 7825.5938432812. The cubic root of 61239919 is about 394.1651308642.

The spelling of 61239919 in words is "sixty-one million, two hundred thirty-nine thousand, nine hundred nineteen".