1620890507 has 2 divisors, whose sum is σ = 1620890508. Its totient is φ = 1620890506.

The previous prime is 1620890473. The next prime is 1620890527. The reversal of 1620890507 is 7050980261.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1620890507 - 2⁸ = 1620890251 is a prime.

It is not a weakly prime, because it can be changed into another prime (1620890527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810445253 + 810445254.

It is an arithmetic number, because the mean of its divisors is an integer number (810445254).

Almost surely, 2^1620890507 is an apocalyptic number.

1620890507 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620890507 is an equidigital number, since it uses as much as digits as its factorization.

1620890507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 1620890507 is about 40260.2844873208. The cubic root of 1620890507 is about 1174.6754515141.

The spelling of 1620890507 in words is "one billion, six hundred twenty million, eight hundred ninety thousand, five hundred seven".