61494989 has 2 divisors, whose sum is σ = 61494990. Its totient is φ = 61494988.

The previous prime is 61494977. The next prime is 61494997. The reversal of 61494989 is 98949416.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53904964 + 7590025 = 7342^2 + 2755^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61494989 is a prime.

It is a super-2 number, since 2×61494989² = 7563267344220242, which contains 22 as substring.

It is a Chen 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 (61494959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30747494 + 30747495.

It is an arithmetic number, because the mean of its divisors is an integer number (30747495).

Almost surely, 2^61494989 is an apocalyptic number.

It is an amenable number.

61494989 is a deficient number, since it is larger than the sum of its proper divisors (1).

61494989 is an equidigital number, since it uses as much as digits as its factorization.

61494989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 50.

The square root of 61494989 is about 7841.8740744799. The cubic root of 61494989 is about 394.7116177413.

The spelling of 61494989 in words is "sixty-one million, four hundred ninety-four thousand, nine hundred eighty-nine".