61861375 has 16 divisors (see below), whose sum is σ = 80563392. Its totient is φ = 47335200.

The previous prime is 61861367. The next prime is 61861403. The reversal of 61861375 is 57316816.

It is not a de Polignac number, because 61861375 - 2³ = 61861367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7884 + ... + 13633.

It is an arithmetic number, because the mean of its divisors is an integer number (5035212).

Almost surely, 2^61861375 is an apocalyptic number.

61861375 is a deficient number, since it is larger than the sum of its proper divisors (18702017).

61861375 is a wasteful number, since it uses less digits than its factorization.

61861375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21555 (or 21545 counting only the distinct ones).

The product of its digits is 30240, while the sum is 37.

The square root of 61861375 is about 7865.2002517418. The cubic root of 61861375 is about 395.4939608879.

It can be divided in two parts, 6186 and 1375, that multiplied together give a triangular number (8505750 = T₄₁₂₄).

The spelling of 61861375 in words is "sixty-one million, eight hundred sixty-one thousand, three hundred seventy-five".