61518749 has 2 divisors, whose sum is σ = 61518750. Its totient is φ = 61518748.

The previous prime is 61518727. The next prime is 61518763. The reversal of 61518749 is 94781516.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53436100 + 8082649 = 7310^2 + 2843^2 .

It is a cyclic number.

It is not a de Polignac number, because 61518749 - 2²⁴ = 44741533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61518719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30759374 + 30759375.

It is an arithmetic number, because the mean of its divisors is an integer number (30759375).

Almost surely, 2^61518749 is an apocalyptic number.

It is an amenable number.

61518749 is a deficient number, since it is larger than the sum of its proper divisors (1).

61518749 is an equidigital number, since it uses as much as digits as its factorization.

61518749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 41.

The square root of 61518749 is about 7843.3888721649. The cubic root of 61518749 is about 394.7624464923.

The spelling of 61518749 in words is "sixty-one million, five hundred eighteen thousand, seven hundred forty-nine".