1961311500 has 72 divisors (see below), whose sum is σ = 6187298208. Its totient is φ = 523015200.

The previous prime is 1961311493. The next prime is 1961311511. The reversal of 1961311500 is 51131691.

1961311500 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 213424 + ... + 222423.

Almost surely, 2^1961311500 is an apocalyptic number.

1961311500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1961311500 is an abundant number, since it is smaller than the sum of its proper divisors (4225986708).

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

1961311500 is a wasteful number, since it uses less digits than its factorization.

1961311500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435872 (or 435857 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 27.

The square root of 1961311500 is about 44286.6966480906. The cubic root of 1961311500 is about 1251.7440189201.

It can be divided in two parts, 19613 and 11500, that added together give a palindrome (31113).

The spelling of 1961311500 in words is "one billion, nine hundred sixty-one million, three hundred eleven thousand, five hundred".