736869444921 has 21 divisors (see below), whose sum is σ = 1104833520799. Its totient is φ = 491230845216.

The previous prime is 736869444901. The next prime is 736869444937. The reversal of 736869444921 is 129444968637.

It is a happy number.

The square root of 736869444921 is 858411.

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

736869444921 is a `hidden beast` number, since 7 + 3 + 6 + 86 + 94 + 449 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 546305765625 + 190563679296 = 739125^2 + 436536^2 .

It is not a de Polignac number, because 736869444921 - 2²⁵ = 736835890489 is a prime.

It is a super-3 number, since 3×736869444921³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (736869444901) by changing a digit.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 23161201 + ... + 23192993.

Almost surely, 2^736869444921 is an apocalyptic number.

736869444921 is the 858411-st square number.

736869444921 is the 429206-th centered octagonal number.

It is an amenable number.

736869444921 is a deficient number, since it is larger than the sum of its proper divisors (367964075878).

736869444921 is an frugal number, since it uses more digits than its factorization.

736869444921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63604 (or 31796 counting only the distinct ones).

The product of its digits is 62705664, while the sum is 63.

The spelling of 736869444921 in words is "seven hundred thirty-six billion, eight hundred sixty-nine million, four hundred forty-four thousand, nine hundred twenty-one".