61693631 has 4 divisors (see below), whose sum is σ = 62705064. Its totient is φ = 60682200.

The previous prime is 61693607. The next prime is 61693637. The reversal of 61693631 is 13639616.

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 61693631 - 2¹⁴ = 61677247 is a prime.

It is a super-2 number, since 2×61693631² = 7612208211928322, 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 = 61693591 and 61693600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61693637) 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, 505625 + ... + 505746.

It is an arithmetic number, because the mean of its divisors is an integer number (15676266).

Almost surely, 2^61693631 is an apocalyptic number.

61693631 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

61693631 is a deficient number, since it is larger than the sum of its proper divisors (1011433).

61693631 is a wasteful number, since it uses less digits than its factorization.

61693631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011432.

The product of its digits is 17496, while the sum is 35.

The square root of 61693631 is about 7854.5293302654. The cubic root of 61693631 is about 395.1361619985.

The spelling of 61693631 in words is "sixty-one million, six hundred ninety-three thousand, six hundred thirty-one".