161401630 has 16 divisors (see below), whose sum is σ = 312871104. Its totient is φ = 59594400.

The previous prime is 161401609. The next prime is 161401631. The reversal of 161401630 is 36104161.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161401631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 620646 + ... + 620905.

It is an arithmetic number, because the mean of its divisors is an integer number (19554444).

Almost surely, 2^161401630 is an apocalyptic number.

161401630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161401630 is a deficient number, since it is larger than the sum of its proper divisors (151469474).

161401630 is a wasteful number, since it uses less digits than its factorization.

161401630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1241571.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 161401630 is about 12704.3941217202. The cubic root of 161401630 is about 544.4641704948.

Adding to 161401630 its reverse (36104161), we get a palindrome (197505791).

The spelling of 161401630 in words is "one hundred sixty-one million, four hundred one thousand, six hundred thirty".