61399441 has 4 divisors (see below), whose sum is σ = 61417012. Its totient is φ = 61381872.

The previous prime is 61399439. The next prime is 61399447. The reversal of 61399441 is 14499316.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40960000 + 20439441 = 6400^2 + 4521^2 .

It is a cyclic number.

It is not a de Polignac number, because 61399441 - 2¹ = 61399439 is a prime.

It is a super-2 number, since 2×61399441² = 7539782710224962, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61399441.

It is not an unprimeable number, because it can be changed into a prime (61399447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1566 + ... + 11191.

It is an arithmetic number, because the mean of its divisors is an integer number (15354253).

Almost surely, 2^61399441 is an apocalyptic number.

It is an amenable number.

61399441 is a deficient number, since it is larger than the sum of its proper divisors (17571).

61399441 is a wasteful number, since it uses less digits than its factorization.

61399441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17570.

The product of its digits is 23328, while the sum is 37.

The square root of 61399441 is about 7835.7795400330. The cubic root of 61399441 is about 394.5070837034.

The spelling of 61399441 in words is "sixty-one million, three hundred ninety-nine thousand, four hundred forty-one".