61223431 has 4 divisors (see below), whose sum is σ = 61561864. Its totient is φ = 60885000.

The previous prime is 61223423. The next prime is 61223467. The reversal of 61223431 is 13432216.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61223431 - 2³ = 61223423 is a prime.

It is a super-2 number, since 2×61223431² = 7496617006823522, 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 (61223411) 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, 168945 + ... + 169306.

It is an arithmetic number, because the mean of its divisors is an integer number (15390466).

Almost surely, 2^61223431 is an apocalyptic number.

61223431 is a deficient number, since it is larger than the sum of its proper divisors (338433).

61223431 is a wasteful number, since it uses less digits than its factorization.

61223431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338432.

The product of its digits is 864, while the sum is 22.

The square root of 61223431 is about 7824.5403059860. The cubic root of 61223431 is about 394.1297531883.

Adding to 61223431 its reverse (13432216), we get a palindrome (74655647).

The spelling of 61223431 in words is "sixty-one million, two hundred twenty-three thousand, four hundred thirty-one".