61945631 has 4 divisors (see below), whose sum is σ = 67577064. Its totient is φ = 56314200.

The previous prime is 61945627. The next prime is 61945633. The reversal of 61945631 is 13654916.

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 61945631 - 2² = 61945627 is a prime.

It is a super-2 number, since 2×61945631² = 7674522399976322, 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 = 61945591 and 61945600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61945633) 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, 2815700 + ... + 2815721.

It is an arithmetic number, because the mean of its divisors is an integer number (16894266).

Almost surely, 2^61945631 is an apocalyptic number.

61945631 is a deficient number, since it is larger than the sum of its proper divisors (5631433).

61945631 is a wasteful number, since it uses less digits than its factorization.

61945631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5631432.

The product of its digits is 19440, while the sum is 35.

The square root of 61945631 is about 7870.5546818506. The cubic root of 61945631 is about 395.6734354089.

The spelling of 61945631 in words is "sixty-one million, nine hundred forty-five thousand, six hundred thirty-one".