61831965 has 16 divisors (see below), whose sum is σ = 106541568. Its totient is φ = 30440256.

The previous prime is 61831963. The next prime is 61831999. The reversal of 61831965 is 56913816.

It is not a de Polignac number, because 61831965 - 2¹ = 61831963 is a prime.

It is a super-2 number, since 2×61831965² = 7646383791522450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61831963) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158349 + ... + 158738.

It is an arithmetic number, because the mean of its divisors is an integer number (6658848).

Almost surely, 2^61831965 is an apocalyptic number.

61831965 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

61831965 is a deficient number, since it is larger than the sum of its proper divisors (44709603).

61831965 is a wasteful number, since it uses less digits than its factorization.

61831965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317108.

The product of its digits is 38880, while the sum is 39.

The square root of 61831965 is about 7863.3304012994. The cubic root of 61831965 is about 395.4312759942.

The spelling of 61831965 in words is "sixty-one million, eight hundred thirty-one thousand, nine hundred sixty-five".