61990801 has 2 divisors, whose sum is σ = 61990802. Its totient is φ = 61990800.

The previous prime is 61990763. The next prime is 61990837. The reversal of 61990801 is 10809916.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60824401 + 1166400 = 7799^2 + 1080^2 .

It is a cyclic number.

It is not a de Polignac number, because 61990801 - 2¹⁵ = 61958033 is a prime.

It is not a weakly prime, because it can be changed into another prime (61990501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30995400 + 30995401.

It is an arithmetic number, because the mean of its divisors is an integer number (30995401).

Almost surely, 2^61990801 is an apocalyptic number.

It is an amenable number.

61990801 is a deficient number, since it is larger than the sum of its proper divisors (1).

61990801 is an equidigital number, since it uses as much as digits as its factorization.

61990801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 61990801 is about 7873.4237152588. The cubic root of 61990801 is about 395.7695854596.

The spelling of 61990801 in words is "sixty-one million, nine hundred ninety thousand, eight hundred one".