61624789 has 2 divisors, whose sum is σ = 61624790. Its totient is φ = 61624788.

The previous prime is 61624781. The next prime is 61624793. The reversal of 61624789 is 98742616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61074225 + 550564 = 7815^2 + 742^2 .

It is a cyclic number.

It is not a de Polignac number, because 61624789 - 2³ = 61624781 is a prime.

It is a super-2 number, since 2×61624789² = 7595229238589042, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61624781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30812394 + 30812395.

It is an arithmetic number, because the mean of its divisors is an integer number (30812395).

Almost surely, 2^61624789 is an apocalyptic number.

It is an amenable number.

61624789 is a deficient number, since it is larger than the sum of its proper divisors (1).

61624789 is an equidigital number, since it uses as much as digits as its factorization.

61624789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 43.

The square root of 61624789 is about 7850.1457948245. The cubic root of 61624789 is about 394.9891339210.

The spelling of 61624789 in words is "sixty-one million, six hundred twenty-four thousand, seven hundred eighty-nine".