61199581 has 2 divisors, whose sum is σ = 61199582. Its totient is φ = 61199580.

The previous prime is 61199533. The next prime is 61199597. The reversal of 61199581 is 18599116.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57836025 + 3363556 = 7605^2 + 1834^2 .

It is a cyclic number.

It is not a de Polignac number, because 61199581 - 2¹¹ = 61197533 is a prime.

It is a super-2 number, since 2×61199581² = 7490777429151122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61199521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30599790 + 30599791.

It is an arithmetic number, because the mean of its divisors is an integer number (30599791).

Almost surely, 2^61199581 is an apocalyptic number.

It is an amenable number.

61199581 is a deficient number, since it is larger than the sum of its proper divisors (1).

61199581 is an equidigital number, since it uses as much as digits as its factorization.

61199581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 40.

The square root of 61199581 is about 7823.0161063365. The cubic root of 61199581 is about 394.0785679076.

The spelling of 61199581 in words is "sixty-one million, one hundred ninety-nine thousand, five hundred eighty-one".