1611401600 has 48 divisors (see below), whose sum is σ = 3980673420. Its totient is φ = 644559360.

The previous prime is 1611401549. The next prime is 1611401611. The reversal of 1611401600 is 61041161.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 248582 + ... + 254981.

Almost surely, 2^1611401600 is an apocalyptic number.

1611401600 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1611401600 is an abundant number, since it is smaller than the sum of its proper divisors (2369271820).

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

1611401600 is an equidigital number, since it uses as much as digits as its factorization.

1611401600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503587 (or 503570 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 1611401600 is about 40142.2670012544. The cubic root of 1611401600 is about 1172.3787288404.

Adding to 1611401600 its reverse (61041161), we get a palindrome (1672442761).

The spelling of 1611401600 in words is "one billion, six hundred eleven million, four hundred one thousand, six hundred".