725121101 has 4 divisors (see below), whose sum is σ = 735943872. Its totient is φ = 714298332.

The previous prime is 725121097. The next prime is 725121107. The reversal of 725121101 is 101121527.

It is a happy number.

725121101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 725121101 - 2² = 725121097 is a prime.

It is a super-2 number, since 2×725121101² = 1051601222230904402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (725121107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5411285 + ... + 5411418.

It is an arithmetic number, because the mean of its divisors is an integer number (183985968).

Almost surely, 2^725121101 is an apocalyptic number.

It is an amenable number.

725121101 is a deficient number, since it is larger than the sum of its proper divisors (10822771).

725121101 is a wasteful number, since it uses less digits than its factorization.

725121101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10822770.

The product of its (nonzero) digits is 140, while the sum is 20.

The square root of 725121101 is about 26928.0727308881. The cubic root of 725121101 is about 898.4009057252.

Adding to 725121101 its reverse (101121527), we get a palindrome (826242628).

The spelling of 725121101 in words is "seven hundred twenty-five million, one hundred twenty-one thousand, one hundred one".