61670861 has 6 divisors (see below), whose sum is σ = 71739630. Its totient is φ = 52860696.

The previous prime is 61670857. The next prime is 61670923. The reversal of 61670861 is 16807616.

It can be written as a sum of positive squares in only one way, i.e., 38812900 + 22857961 = 6230^2 + 4781^2 .

It is not a de Polignac number, because 61670861 - 2² = 61670857 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61670801) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 629246 + ... + 629343.

It is an arithmetic number, because the mean of its divisors is an integer number (11956605).

Almost surely, 2^61670861 is an apocalyptic number.

It is an amenable number.

61670861 is a deficient number, since it is larger than the sum of its proper divisors (10068769).

61670861 is a wasteful number, since it uses less digits than its factorization.

61670861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1258603 (or 1258596 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 61670861 is about 7853.0797143541. The cubic root of 61670861 is about 395.0875434869.

The spelling of 61670861 in words is "sixty-one million, six hundred seventy thousand, eight hundred sixty-one".