61861965 has 32 divisors (see below), whose sum is σ = 110906496. Its totient is φ = 29180160.

The previous prime is 61861951. The next prime is 61861979. The reversal of 61861965 is 56916816.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (61861951) and next prime (61861979).

It is not a de Polignac number, because 61861965 - 2¹⁵ = 61829197 is a prime.

It is a super-2 number, since 2×61861965² = 7653805427322450, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1039 + ... + 11171.

It is an arithmetic number, because the mean of its divisors is an integer number (3465828).

Almost surely, 2^61861965 is an apocalyptic number.

It is an amenable number.

61861965 is a deficient number, since it is larger than the sum of its proper divisors (49044531).

61861965 is a wasteful number, since it uses less digits than its factorization.

61861965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10189.

The product of its digits is 77760, while the sum is 42.

The square root of 61861965 is about 7865.2377586440. The cubic root of 61861965 is about 395.4952182190.

It can be divided in two parts, 61861 and 965, that added together give a palindrome (62826).

The spelling of 61861965 in words is "sixty-one million, eight hundred sixty-one thousand, nine hundred sixty-five".