61522139 has 8 divisors (see below), whose sum is σ = 71301888. Its totient is φ = 51990120.

The previous prime is 61522129. The next prime is 61522141. The reversal of 61522139 is 93122516.

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

It is a de Polignac number, because none of the positive numbers 2^k-61522139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61522129) 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, 61397 + ... + 62390.

It is an arithmetic number, because the mean of its divisors is an integer number (8912736).

Almost surely, 2^61522139 is an apocalyptic number.

61522139 is a deficient number, since it is larger than the sum of its proper divisors (9779749).

61522139 is a wasteful number, since it uses less digits than its factorization.

61522139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123865.

The product of its digits is 3240, while the sum is 29.

The square root of 61522139 is about 7843.6049747549. The cubic root of 61522139 is about 394.7696975073.

It can be divided in two parts, 61522 and 139, that multiplied together give a palindrome (8551558).

The spelling of 61522139 in words is "sixty-one million, five hundred twenty-two thousand, one hundred thirty-nine".