2156982574 has 4 divisors (see below), whose sum is σ = 3235473864. Its totient is φ = 1078491286.

The previous prime is 2156982547. The next prime is 2156982577. The reversal of 2156982574 is 4752896512.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156982577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 539245642 + ... + 539245645.

It is an arithmetic number, because the mean of its divisors is an integer number (808868466).

Almost surely, 2^2156982574 is an apocalyptic number.

2156982574 is a deficient number, since it is larger than the sum of its proper divisors (1078491290).

2156982574 is a wasteful number, since it uses less digits than its factorization.

2156982574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078491289.

The product of its digits is 1209600, while the sum is 49.

The square root of 2156982574 is about 46443.3264743171. The cubic root of 2156982574 is about 1292.0586032104.

The spelling of 2156982574 in words is "two billion, one hundred fifty-six million, nine hundred eighty-two thousand, five hundred seventy-four".