61139671 has 2 divisors, whose sum is σ = 61139672. Its totient is φ = 61139670.

The previous prime is 61139653. The next prime is 61139677. The reversal of 61139671 is 17693116.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61139671 - 2¹⁷ = 61008599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61139677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30569835 + 30569836.

It is an arithmetic number, because the mean of its divisors is an integer number (30569836).

Almost surely, 2^61139671 is an apocalyptic number.

61139671 is a deficient number, since it is larger than the sum of its proper divisors (1).

61139671 is an equidigital number, since it uses as much as digits as its factorization.

61139671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804, while the sum is 34.

The square root of 61139671 is about 7819.1860829629. The cubic root of 61139671 is about 393.9499343738.

The spelling of 61139671 in words is "sixty-one million, one hundred thirty-nine thousand, six hundred seventy-one".