61481139 has 16 divisors (see below), whose sum is σ = 85992192. Its totient is φ = 38997728.

The previous prime is 61481117. The next prime is 61481141. The reversal of 61481139 is 93118416.

It is a cyclic number.

It is not a de Polignac number, because 61481139 - 2¹² = 61477043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61481149) 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, 11332 + ... + 15854.

It is an arithmetic number, because the mean of its divisors is an integer number (5374512).

Almost surely, 2^61481139 is an apocalyptic number.

61481139 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

61481139 is a deficient number, since it is larger than the sum of its proper divisors (24511053).

61481139 is a wasteful number, since it uses less digits than its factorization.

61481139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4746.

The product of its digits is 5184, while the sum is 33.

The square root of 61481139 is about 7840.9909450273. The cubic root of 61481139 is about 394.6819829886.

The spelling of 61481139 in words is "sixty-one million, four hundred eighty-one thousand, one hundred thirty-nine".