61439631 has 8 divisors (see below), whose sum is σ = 89366784. Its totient is φ = 37236120.

The previous prime is 61439621. The next prime is 61439633. The reversal of 61439631 is 13693416.

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

It is not a de Polignac number, because 61439631 - 2⁷ = 61439503 is a prime.

It is a super-2 number, since 2×61439631² = 7549656514832322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 1861807 = 61439631 / (6 + 1 + 4 + 3 + 9 + 6 + 3 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 61439592 and 61439601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61439633) 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 7 ways as a sum of consecutive naturals, for example, 930871 + ... + 930936.

It is an arithmetic number, because the mean of its divisors is an integer number (11170848).

Almost surely, 2^61439631 is an apocalyptic number.

61439631 is a deficient number, since it is larger than the sum of its proper divisors (27927153).

61439631 is a wasteful number, since it uses less digits than its factorization.

61439631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1861821.

The product of its digits is 11664, while the sum is 33.

The square root of 61439631 is about 7838.3436388053. The cubic root of 61439631 is about 394.5931419327.

The spelling of 61439631 in words is "sixty-one million, four hundred thirty-nine thousand, six hundred thirty-one".