61897181 has 2 divisors, whose sum is σ = 61897182. Its totient is φ = 61897180.

The previous prime is 61897141. The next prime is 61897201. The reversal of 61897181 is 18179816.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61371556 + 525625 = 7834^2 + 725^2 .

It is a cyclic number.

It is not a de Polignac number, because 61897181 - 2²² = 57702877 is a prime.

It is a super-2 number, since 2×61897181² = 7662522031493522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61897141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30948590 + 30948591.

It is an arithmetic number, because the mean of its divisors is an integer number (30948591).

Almost surely, 2^61897181 is an apocalyptic number.

It is an amenable number.

61897181 is a deficient number, since it is larger than the sum of its proper divisors (1).

61897181 is an equidigital number, since it uses as much as digits as its factorization.

61897181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 41.

The square root of 61897181 is about 7867.4761518545. The cubic root of 61897181 is about 395.5702514944.

The spelling of 61897181 in words is "sixty-one million, eight hundred ninety-seven thousand, one hundred eighty-one".