61546431 has 4 divisors (see below), whose sum is σ = 82061912. Its totient is φ = 41030952.

The previous prime is 61546427. The next prime is 61546447. The reversal of 61546431 is 13464516.

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

It is not a de Polignac number, because 61546431 - 2² = 61546427 is a prime.

It is a super-2 number, since 2×61546431² = 7575926337675522, 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 (61546831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10257736 + ... + 10257741.

It is an arithmetic number, because the mean of its divisors is an integer number (20515478).

Almost surely, 2^61546431 is an apocalyptic number.

61546431 is a deficient number, since it is larger than the sum of its proper divisors (20515481).

61546431 is a wasteful number, since it uses less digits than its factorization.

61546431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20515480.

The product of its digits is 8640, while the sum is 30.

The square root of 61546431 is about 7845.1533445816. The cubic root of 61546431 is about 394.8216489064.

It can be divided in two parts, 615464 and 31, that added together give a triangular number (615495 = T₁₁₀₉).

The spelling of 61546431 in words is "sixty-one million, five hundred forty-six thousand, four hundred thirty-one".