1651812772 has 6 divisors (see below), whose sum is σ = 2890672358. Its totient is φ = 825906384.

The previous prime is 1651812749. The next prime is 1651812779. The reversal of 1651812772 is 2772181561.

It can be written as a sum of positive squares in only one way, i.e., 1630059876 + 21752896 = 40374^2 + 4664^2 .

It is not an unprimeable number, because it can be changed into a prime (1651812779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 206476593 + ... + 206476600.

Almost surely, 2^1651812772 is an apocalyptic number.

It is an amenable number.

1651812772 is a deficient number, since it is larger than the sum of its proper divisors (1238859586).

1651812772 is a wasteful number, since it uses less digits than its factorization.

1651812772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412953197 (or 412953195 counting only the distinct ones).

The product of its digits is 47040, while the sum is 40.

The square root of 1651812772 is about 40642.4995786430. The cubic root of 1651812772 is about 1182.0983376585.

The spelling of 1651812772 in words is "one billion, six hundred fifty-one million, eight hundred twelve thousand, seven hundred seventy-two".