61423531 has 4 divisors (see below), whose sum is σ = 66148432. Its totient is φ = 56698632.

The previous prime is 61423529. The next prime is 61423541. The reversal of 61423531 is 13532416.

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 61423531 - 2¹ = 61423529 is a prime.

It is a super-2 number, since 2×61423531² = 7545700321015922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61423496 and 61423505.

It is not an unprimeable number, because it can be changed into a prime (61423541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2362431 + ... + 2362456.

It is an arithmetic number, because the mean of its divisors is an integer number (16537108).

Almost surely, 2^61423531 is an apocalyptic number.

61423531 is a deficient number, since it is larger than the sum of its proper divisors (4724901).

61423531 is a wasteful number, since it uses less digits than its factorization.

61423531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4724900.

The product of its digits is 2160, while the sum is 25.

The square root of 61423531 is about 7837.3165688263. The cubic root of 61423531 is about 394.5586717573.

Adding to 61423531 its reverse (13532416), we get a palindrome (74955947).

The spelling of 61423531 in words is "sixty-one million, four hundred twenty-three thousand, five hundred thirty-one".