61138489 has 2 divisors, whose sum is σ = 61138490. Its totient is φ = 61138488.

The previous prime is 61138459. The next prime is 61138499. The reversal of 61138489 is 98483116.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55756089 + 5382400 = 7467^2 + 2320^2 .

It is a cyclic number.

It is not a de Polignac number, because 61138489 - 2¹⁷ = 61007417 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61138459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30569244 + 30569245.

It is an arithmetic number, because the mean of its divisors is an integer number (30569245).

Almost surely, 2^61138489 is an apocalyptic number.

It is an amenable number.

61138489 is a deficient number, since it is larger than the sum of its proper divisors (1).

61138489 is an equidigital number, since it uses as much as digits as its factorization.

61138489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 40.

The square root of 61138489 is about 7819.1104992832. The cubic root of 61138489 is about 393.9473956412.

The spelling of 61138489 in words is "sixty-one million, one hundred thirty-eight thousand, four hundred eighty-nine".