61345831 has 4 divisors (see below), whose sum is σ = 62035200. Its totient is φ = 60656464.

The previous prime is 61345811. The next prime is 61345841. The reversal of 61345831 is 13854316.

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 61345831 - 2¹⁹ = 60821543 is a prime.

It is a super-2 number, since 2×61345831² = 7526621962161122, 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 = 61345793 and 61345802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61345811) 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, 344551 + ... + 344728.

It is an arithmetic number, because the mean of its divisors is an integer number (15508800).

Almost surely, 2^61345831 is an apocalyptic number.

61345831 is a deficient number, since it is larger than the sum of its proper divisors (689369).

61345831 is an equidigital number, since it uses as much as digits as its factorization.

61345831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689368.

The product of its digits is 8640, while the sum is 31.

The square root of 61345831 is about 7832.3579463658. The cubic root of 61345831 is about 394.3922309574.

The spelling of 61345831 in words is "sixty-one million, three hundred forty-five thousand, eight hundred thirty-one".