691941148900 has 81 divisors (see below), whose sum is σ = 1512842516283. Its totient is φ = 274703539200.

The previous prime is 691941148883. The next prime is 691941148907. The reversal of 691941148900 is 9841149196.

The square root of 691941148900 is 831830.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 111284956836 + 580656192064 = 333594^2 + 762008^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (691941148907) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1605431685 + ... + 1605432115.

Almost surely, 2^691941148900 is an apocalyptic number.

691941148900 is the 831830-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 691941148900

691941148900 is an abundant number, since it is smaller than the sum of its proper divisors (820901367383).

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

691941148900 is an equidigital number, since it uses as much as digits as its factorization.

691941148900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1262 (or 631 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 52.

The spelling of 691941148900 in words is "six hundred ninety-one billion, nine hundred forty-one million, one hundred forty-eight thousand, nine hundred".