1641120690 has 128 divisors (see below), whose sum is σ = 4381267968. Its totient is φ = 390113280.

The previous prime is 1641120683. The next prime is 1641120697. The reversal of 1641120690 is 960211461.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1641120683) and next prime (1641120697).

It is a super-2 number, since 2×1641120690² = 5386554238292152200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (1641120697) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5345517 + ... + 5345823.

It is an arithmetic number, because the mean of its divisors is an integer number (34228656).

Almost surely, 2^1641120690 is an apocalyptic number.

1641120690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1641120690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2190633984).

1641120690 is an abundant number, since it is smaller than the sum of its proper divisors (2740147278).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1641120690 is a wasteful number, since it uses less digits than its factorization.

1641120690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 1641120690 is about 40510.7478331368. The cubic root of 1641120690 is about 1179.5422647682.

The spelling of 1641120690 in words is "one billion, six hundred forty-one million, one hundred twenty thousand, six hundred ninety".