61990633 has 2 divisors, whose sum is σ = 61990634. Its totient is φ = 61990632.

The previous prime is 61990627. The next prime is 61990637. The reversal of 61990633 is 33609916.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41306329 + 20684304 = 6427^2 + 4548^2 .

It is a cyclic number.

It is not a de Polignac number, because 61990633 - 2⁹ = 61990121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61990592 and 61990601.

It is not a weakly prime, because it can be changed into another prime (61990637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30995316 + 30995317.

It is an arithmetic number, because the mean of its divisors is an integer number (30995317).

Almost surely, 2^61990633 is an apocalyptic number.

It is an amenable number.

61990633 is a deficient number, since it is larger than the sum of its proper divisors (1).

61990633 is an equidigital number, since it uses as much as digits as its factorization.

61990633 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244, while the sum is 37.

The square root of 61990633 is about 7873.4130464494. The cubic root of 61990633 is about 395.7692279369.

The spelling of 61990633 in words is "sixty-one million, nine hundred ninety thousand, six hundred thirty-three".