61544431 has 8 divisors (see below), whose sum is σ = 68070464. Its totient is φ = 55274400.

The previous prime is 61544423. The next prime is 61544449. The reversal of 61544431 is 13444516.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61544431 - 2³ = 61544423 is a prime.

It is a super-2 number, since 2×61544431² = 7575433974227522, 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 61544431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61524431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63495 + ... + 64456.

It is an arithmetic number, because the mean of its divisors is an integer number (8508808).

Almost surely, 2^61544431 is an apocalyptic number.

61544431 is a deficient number, since it is larger than the sum of its proper divisors (6526033).

61544431 is a wasteful number, since it uses less digits than its factorization.

61544431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128001.

The product of its digits is 5760, while the sum is 28.

The square root of 61544431 is about 7845.0258763117. The cubic root of 61544431 is about 394.8173721794.

Adding to 61544431 its reverse (13444516), we get a palindrome (74988947).

It can be divided in two parts, 6154 and 4431, that added together give a triangular number (10585 = T₁₄₅).

The spelling of 61544431 in words is "sixty-one million, five hundred forty-four thousand, four hundred thirty-one".