726161261 has 4 divisors (see below), whose sum is σ = 829898592. Its totient is φ = 622423932.

The previous prime is 726161243. The next prime is 726161269. The reversal of 726161261 is 162161627.

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 726161261 - 2²² = 721966957 is a prime.

It is a super-2 number, since 2×726161261² = 1054620353954220242, 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 (726161269) 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, 51868655 + ... + 51868668.

It is an arithmetic number, because the mean of its divisors is an integer number (207474648).

Almost surely, 2^726161261 is an apocalyptic number.

It is an amenable number.

726161261 is a deficient number, since it is larger than the sum of its proper divisors (103737331).

726161261 is a wasteful number, since it uses less digits than its factorization.

726161261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103737330.

The product of its digits is 6048, while the sum is 32.

The square root of 726161261 is about 26947.3794829850. The cubic root of 726161261 is about 898.8302750238.

The spelling of 726161261 in words is "seven hundred twenty-six million, one hundred sixty-one thousand, two hundred sixty-one".