722131 has 4 divisors (see below), whose sum is σ = 753552. Its totient is φ = 690712.

The previous prime is 722123. The next prime is 722147. The reversal of 722131 is 131227.

722131 = T₂₃₉ + T₂₄₀ + ... + T₂₆₁.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131227 = 281 ⋅467.

It is a cyclic number.

It is not a de Polignac number, because 722131 - 2³ = 722123 is a prime.

It is a super-2 number, since 2×722131² = 1042946362322, 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 (722431) 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, 15676 + ... + 15721.

It is an arithmetic number, because the mean of its divisors is an integer number (188388).

2⁷²²¹³¹ is an apocalyptic number.

722131 is a deficient number, since it is larger than the sum of its proper divisors (31421).

722131 is a wasteful number, since it uses less digits than its factorization.

722131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31420.

The product of its digits is 84, while the sum is 16.

The square root of 722131 is about 849.7829134550. The cubic root of 722131 is about 89.7164325915.

Adding to 722131 its reverse (131227), we get a palindrome (853358).

The spelling of 722131 in words is "seven hundred twenty-two thousand, one hundred thirty-one".