307990061 has 4 divisors (see below), whose sum is σ = 308617824. Its totient is φ = 307362300.

The previous prime is 307990051. The next prime is 307990087. The reversal of 307990061 is 160099703.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 160099703 = 37 ⋅4327019.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-307990061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (307990031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 313145 + ... + 314126.

It is an arithmetic number, because the mean of its divisors is an integer number (77154456).

Almost surely, 2^307990061 is an apocalyptic number.

It is an amenable number.

307990061 is a deficient number, since it is larger than the sum of its proper divisors (627763).

307990061 is an equidigital number, since it uses as much as digits as its factorization.

307990061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627762.

The product of its (nonzero) digits is 10206, while the sum is 35.

The square root of 307990061 is about 17549.6456089575. The cubic root of 307990061 is about 675.3240773941.

The spelling of 307990061 in words is "three hundred seven million, nine hundred ninety thousand, sixty-one".