1990656013 has 2 divisors, whose sum is σ = 1990656014. Its totient is φ = 1990656012.

The previous prime is 1990656007. The next prime is 1990656023. The reversal of 1990656013 is 3106560991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1518115369 + 472540644 = 38963^2 + 21738^2 .

It is a cyclic number.

It is not a de Polignac number, because 1990656013 - 2¹³ = 1990647821 is a prime.

It is a super-2 number, since 2×1990656013² = 7925422724186112338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1990656023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 995328006 + 995328007.

It is an arithmetic number, because the mean of its divisors is an integer number (995328007).

Almost surely, 2^1990656013 is an apocalyptic number.

It is an amenable number.

1990656013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1990656013 is an equidigital number, since it uses as much as digits as its factorization.

1990656013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43740, while the sum is 40.

The square root of 1990656013 is about 44616.7682939946. The cubic root of 1990656013 is about 1257.9558719586.

The spelling of 1990656013 in words is "one billion, nine hundred ninety million, six hundred fifty-six thousand, thirteen".