161641494 has 80 divisors (see below), whose sum is σ = 422532000. Its totient is φ = 46167408.

The previous prime is 161641481. The next prime is 161641499. The reversal of 161641494 is 494146161.

161641494 is a `hidden beast` number, since 1 + 6 + 1 + 641 + 4 + 9 + 4 = 666.

It is a super-2 number, since 2×161641494² = 52255945165104072, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161641499) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 54112 + ... + 57020.

It is an arithmetic number, because the mean of its divisors is an integer number (5281650).

Almost surely, 2^161641494 is an apocalyptic number.

161641494 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161641494, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (211266000).

161641494 is an abundant number, since it is smaller than the sum of its proper divisors (260890506).

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

161641494 is an equidigital number, since it uses as much as digits as its factorization.

161641494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2944 (or 2921 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 161641494 is about 12713.8308152972. The cubic root of 161641494 is about 544.7337520602.

The spelling of 161641494 in words is "one hundred sixty-one million, six hundred forty-one thousand, four hundred ninety-four".