61672189 has 2 divisors, whose sum is σ = 61672190. Its totient is φ = 61672188.

The previous prime is 61672151. The next prime is 61672213. The reversal of 61672189 is 98127616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61544025 + 128164 = 7845^2 + 358^2 .

It is a cyclic number.

It is not a de Polignac number, because 61672189 - 2⁹ = 61671677 is a 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 (61672109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30836094 + 30836095.

It is an arithmetic number, because the mean of its divisors is an integer number (30836095).

Almost surely, 2^61672189 is an apocalyptic number.

It is an amenable number.

61672189 is a deficient number, since it is larger than the sum of its proper divisors (1).

61672189 is an equidigital number, since it uses as much as digits as its factorization.

61672189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 40.

The square root of 61672189 is about 7853.1642667144. The cubic root of 61672189 is about 395.0903793616.

The spelling of 61672189 in words is "sixty-one million, six hundred seventy-two thousand, one hundred eighty-nine".