2156434642 has 4 divisors (see below), whose sum is σ = 3234651966. Its totient is φ = 1078217320.

The previous prime is 2156434627. The next prime is 2156434699. The reversal of 2156434642 is 2464346512.

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

It can be written as a sum of positive squares in only one way, i.e., 1539856081 + 616578561 = 39241^2 + 24831^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 539108659 + ... + 539108662.

Almost surely, 2^2156434642 is an apocalyptic number.

2156434642 is a deficient number, since it is larger than the sum of its proper divisors (1078217324).

2156434642 is a wasteful number, since it uses less digits than its factorization.

2156434642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078217323.

The product of its digits is 138240, while the sum is 37.

The square root of 2156434642 is about 46437.4271681798. The cubic root of 2156434642 is about 1291.9491879840.

The spelling of 2156434642 in words is "two billion, one hundred fifty-six million, four hundred thirty-four thousand, six hundred forty-two".