61149917 has 2 divisors, whose sum is σ = 61149918. Its totient is φ = 61149916.

The previous prime is 61149859. The next prime is 61149919. The reversal of 61149917 is 71994116.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57592921 + 3556996 = 7589^2 + 1886^2 .

It is a cyclic number.

It is not a de Polignac number, because 61149917 - 2¹⁴ = 61133533 is a prime.

Together with 61149919, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61149919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30574958 + 30574959.

It is an arithmetic number, because the mean of its divisors is an integer number (30574959).

Almost surely, 2^61149917 is an apocalyptic number.

It is an amenable number.

61149917 is a deficient number, since it is larger than the sum of its proper divisors (1).

61149917 is an equidigital number, since it uses as much as digits as its factorization.

61149917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 38.

The square root of 61149917 is about 7819.8412387976. The cubic root of 61149917 is about 393.9719396475.

The spelling of 61149917 in words is "sixty-one million, one hundred forty-nine thousand, nine hundred seventeen".