61671619 has 2 divisors, whose sum is σ = 61671620. Its totient is φ = 61671618.

The previous prime is 61671613. The next prime is 61671653. The reversal of 61671619 is 91617616.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61671619 - 2¹⁵ = 61638851 is a prime.

It is a super-2 number, since 2×61671619² = 7606777180162322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61671613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30835809 + 30835810.

It is an arithmetic number, because the mean of its divisors is an integer number (30835810).

Almost surely, 2^61671619 is an apocalyptic number.

61671619 is a deficient number, since it is larger than the sum of its proper divisors (1).

61671619 is an equidigital number, since it uses as much as digits as its factorization.

61671619 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 37.

The square root of 61671619 is about 7853.1279755267. The cubic root of 61671619 is about 395.0891621613.

The spelling of 61671619 in words is "sixty-one million, six hundred seventy-one thousand, six hundred nineteen".