611821972 has 6 divisors (see below), whose sum is σ = 1070688458. Its totient is φ = 305910984.

The previous prime is 611821949. The next prime is 611821997. The reversal of 611821972 is 279128116.

611821972 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 320983056 + 290838916 = 17916^2 + 17054^2 .

It is a super-2 number, since 2×611821972² = 748652250843937568, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76477743 + ... + 76477750.

Almost surely, 2^611821972 is an apocalyptic number.

It is an amenable number.

611821972 is a deficient number, since it is larger than the sum of its proper divisors (458866486).

611821972 is a wasteful number, since it uses less digits than its factorization.

611821972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152955497 (or 152955495 counting only the distinct ones).

The product of its digits is 12096, while the sum is 37.

The square root of 611821972 is about 24735.0353143067. The cubic root of 611821972 is about 848.9361416969.

The spelling of 611821972 in words is "six hundred eleven million, eight hundred twenty-one thousand, nine hundred seventy-two".