61498909 has 2 divisors, whose sum is σ = 61498910. Its totient is φ = 61498908.

The previous prime is 61498903. The next prime is 61498939. The reversal of 61498909 is 90989416.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58094884 + 3404025 = 7622^2 + 1845^2 .

It is a cyclic number.

It is not a de Polignac number, because 61498909 - 2⁹ = 61498397 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 (61498903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30749454 + 30749455.

It is an arithmetic number, because the mean of its divisors is an integer number (30749455).

Almost surely, 2^61498909 is an apocalyptic number.

It is an amenable number.

61498909 is a deficient number, since it is larger than the sum of its proper divisors (1).

61498909 is an equidigital number, since it uses as much as digits as its factorization.

61498909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 61498909 is about 7842.1240107512. The cubic root of 61498909 is about 394.7200045312.

The spelling of 61498909 in words is "sixty-one million, four hundred ninety-eight thousand, nine hundred nine".