61425989 has 2 divisors, whose sum is σ = 61425990. Its totient is φ = 61425988.

The previous prime is 61425983. The next prime is 61426003. The reversal of 61425989 is 98952416.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61230625 + 195364 = 7825^2 + 442^2 .

It is a cyclic number.

It is not a de Polignac number, because 61425989 - 2⁸ = 61425733 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61425983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30712994 + 30712995.

It is an arithmetic number, because the mean of its divisors is an integer number (30712995).

Almost surely, 2^61425989 is an apocalyptic number.

It is an amenable number.

61425989 is a deficient number, since it is larger than the sum of its proper divisors (1).

61425989 is an equidigital number, since it uses as much as digits as its factorization.

61425989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 44.

The square root of 61425989 is about 7837.4733811350. The cubic root of 61425989 is about 394.5639347363.

The spelling of 61425989 in words is "sixty-one million, four hundred twenty-five thousand, nine hundred eighty-nine".