61861775 has 12 divisors (see below), whose sum is σ = 76841064. Its totient is φ = 49404000.

The previous prime is 61861769. The next prime is 61861781. The reversal of 61861775 is 57716816.

It is an interprime number because it is at equal distance from previous prime (61861769) and next prime (61861781).

It is not a de Polignac number, because 61861775 - 2¹⁴ = 61845391 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 11 ways as a sum of consecutive naturals, for example, 15485 + ... + 19065.

It is an arithmetic number, because the mean of its divisors is an integer number (6403422).

Almost surely, 2^61861775 is an apocalyptic number.

61861775 is a deficient number, since it is larger than the sum of its proper divisors (14979289).

61861775 is a wasteful number, since it uses less digits than its factorization.

61861775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4282 (or 4277 counting only the distinct ones).

The product of its digits is 70560, while the sum is 41.

The square root of 61861775 is about 7865.2256801696. The cubic root of 61861775 is about 395.4948133167.

The spelling of 61861775 in words is "sixty-one million, eight hundred sixty-one thousand, seven hundred seventy-five".