990617401 has 2 divisors, whose sum is σ = 990617402. Its totient is φ = 990617400.

The previous prime is 990617389. The next prime is 990617461. The reversal of 990617401 is 104716099.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 921061801 + 69555600 = 30349^2 + 8340^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990617401 is a prime.

It is a super-4 number, since 4×990617401⁴ (a number of 37 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (990617461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495308700 + 495308701.

It is an arithmetic number, because the mean of its divisors is an integer number (495308701).

Almost surely, 2^990617401 is an apocalyptic number.

It is an amenable number.

990617401 is a deficient number, since it is larger than the sum of its proper divisors (1).

990617401 is an equidigital number, since it uses as much as digits as its factorization.

990617401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 990617401 is about 31474.0750618664. The cubic root of 990617401 is about 996.8626342298.

The spelling of 990617401 in words is "nine hundred ninety million, six hundred seventeen thousand, four hundred one".