1764999981 has 6 divisors (see below), whose sum is σ = 2549444430. Its totient is φ = 1176666648.

The previous prime is 1764999923. The next prime is 1764999983. The reversal of 1764999981 is 1899994671.

It can be written as a sum of positive squares in only one way, i.e., 1707755625 + 57244356 = 41325^2 + 7566^2 .

It is not a de Polignac number, because 1764999981 - 2⁶ = 1764999917 is a prime.

It is a super-2 number, since 2×1764999981² = 6230449865860000722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1764999983) 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, 98055546 + ... + 98055563.

It is an arithmetic number, because the mean of its divisors is an integer number (424907405).

Almost surely, 2^1764999981 is an apocalyptic number.

It is an amenable number.

1764999981 is a deficient number, since it is larger than the sum of its proper divisors (784444449).

1764999981 is a wasteful number, since it uses less digits than its factorization.

1764999981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196111115 (or 196111112 counting only the distinct ones).

The product of its digits is 8817984, while the sum is 63.

The square root of 1764999981 is about 42011.9028490736. The cubic root of 1764999981 is about 1208.5043973915.

The spelling of 1764999981 in words is "one billion, seven hundred sixty-four million, nine hundred ninety-nine thousand, nine hundred eighty-one".