1861247156 has 12 divisors (see below), whose sum is σ = 3257628192. Its totient is φ = 930496248.

The previous prime is 1861247153. The next prime is 1861247221. The reversal of 1861247156 is 6517421681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861247153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6071 + ... + 61313.

It is an arithmetic number, because the mean of its divisors is an integer number (271469016).

Almost surely, 2^1861247156 is an apocalyptic number.

It is an amenable number.

1861247156 is a deficient number, since it is larger than the sum of its proper divisors (1396381036).

1861247156 is a wasteful number, since it uses less digits than its factorization.

1861247156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63670 (or 63668 counting only the distinct ones).

The product of its digits is 80640, while the sum is 41.

The square root of 1861247156 is about 43142.1737514465. The cubic root of 1861247156 is about 1230.0837530825.

The spelling of 1861247156 in words is "one billion, eight hundred sixty-one million, two hundred forty-seven thousand, one hundred fifty-six".