61481431 has 12 divisors (see below), whose sum is σ = 68861016. Its totient is φ = 54831920.

The previous prime is 61481429. The next prime is 61481447. The reversal of 61481431 is 13418416.

It is not a de Polignac number, because 61481431 - 2¹ = 61481429 is a prime.

It is a super-2 number, since 2×61481431² = 7559932715615522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61481431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61481471) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1620 + ... + 11206.

It is an arithmetic number, because the mean of its divisors is an integer number (5738418).

Almost surely, 2^61481431 is an apocalyptic number.

61481431 is a deficient number, since it is larger than the sum of its proper divisors (7379585).

61481431 is a wasteful number, since it uses less digits than its factorization.

61481431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9662 (or 9651 counting only the distinct ones).

The product of its digits is 2304, while the sum is 28.

The square root of 61481431 is about 7841.0095651007. The cubic root of 61481431 is about 394.6826078250.

Adding to 61481431 its reverse (13418416), we get a palindrome (74899847).

The spelling of 61481431 in words is "sixty-one million, four hundred eighty-one thousand, four hundred thirty-one".