1641490387 has 2 divisors, whose sum is σ = 1641490388. Its totient is φ = 1641490386.

The previous prime is 1641490349. The next prime is 1641490399. The reversal of 1641490387 is 7830941461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1641490387 - 2¹¹ = 1641488339 is a prime.

It is a super-2 number, since 2×1641490387² = 5388981381226819538, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1641490307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820745193 + 820745194.

It is an arithmetic number, because the mean of its divisors is an integer number (820745194).

Almost surely, 2^1641490387 is an apocalyptic number.

1641490387 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641490387 is an equidigital number, since it uses as much as digits as its factorization.

1641490387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 1641490387 is about 40515.3105257753. The cubic root of 1641490387 is about 1179.6308303641.

The spelling of 1641490387 in words is "one billion, six hundred forty-one million, four hundred ninety thousand, three hundred eighty-seven".