61872581 has 2 divisors, whose sum is σ = 61872582. Its totient is φ = 61872580.

The previous prime is 61872541. The next prime is 61872611. The reversal of 61872581 is 18527816.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41088100 + 20784481 = 6410^2 + 4559^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61872581 is a prime.

It is a super-2 number, since 2×61872581² = 7656432559203122, which contains 22 as substring.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61872511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30936290 + 30936291.

It is an arithmetic number, because the mean of its divisors is an integer number (30936291).

Almost surely, 2^61872581 is an apocalyptic number.

It is an amenable number.

61872581 is a deficient number, since it is larger than the sum of its proper divisors (1).

61872581 is an equidigital number, since it uses as much as digits as its factorization.

61872581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26880, while the sum is 38.

The square root of 61872581 is about 7865.9125980397. The cubic root of 61872581 is about 395.5178402889.

The spelling of 61872581 in words is "sixty-one million, eight hundred seventy-two thousand, five hundred eighty-one".