61858949 has 2 divisors, whose sum is σ = 61858950. Its totient is φ = 61858948.

The previous prime is 61858939. The next prime is 61858957. The reversal of 61858949 is 94985816.

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., 47472100 + 14386849 = 6890^2 + 3793^2 .

It is a cyclic number.

It is not a de Polignac number, because 61858949 - 2⁴ = 61858933 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 61858897 and 61858906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61858939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30929474 + 30929475.

It is an arithmetic number, because the mean of its divisors is an integer number (30929475).

Almost surely, 2^61858949 is an apocalyptic number.

It is an amenable number.

61858949 is a deficient number, since it is larger than the sum of its proper divisors (1).

61858949 is an equidigital number, since it uses as much as digits as its factorization.

61858949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 622080, while the sum is 50.

The square root of 61858949 is about 7865.0460265659. The cubic root of 61858949 is about 395.4887908288.

The spelling of 61858949 in words is "sixty-one million, eight hundred fifty-eight thousand, nine hundred forty-nine".