1981577234 has 16 divisors (see below), whose sum is σ = 3658296768. Its totient is φ = 783920592.

The previous prime is 1981577233. The next prime is 1981577249. The reversal of 1981577234 is 4327751891.

It is not an unprimeable number, because it can be changed into a prime (1981577233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5443712 + ... + 5444075.

It is an arithmetic number, because the mean of its divisors is an integer number (228643548).

Almost surely, 2^1981577234 is an apocalyptic number.

1981577234 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1981577234 is a deficient number, since it is larger than the sum of its proper divisors (1676719534).

1981577234 is a wasteful number, since it uses less digits than its factorization.

1981577234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10887809.

The product of its digits is 423360, while the sum is 47.

The square root of 1981577234 is about 44514.9102436476. The cubic root of 1981577234 is about 1256.0405720899.

The spelling of 1981577234 in words is "one billion, nine hundred eighty-one million, five hundred seventy-seven thousand, two hundred thirty-four".