921061801 has 27 divisors (see below), whose sum is σ = 1058004759. Its totient is φ = 801213600.

The previous prime is 921061793. The next prime is 921061811. The reversal of 921061801 is 108160129.

It is a happy number.

The square root of 921061801 is 30349.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 176863401 + 744198400 = 13299^2 + 27280^2 .

It is not a de Polignac number, because 921061801 - 2³ = 921061793 is a prime.

It is a super-2 number, since 2×921061801² = 1696709682522727202, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 921061801.

It is not an unprimeable number, because it can be changed into a prime (921061811) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 10348965 + ... + 10349053.

Almost surely, 2^921061801 is an apocalyptic number.

921061801 is the 30349-th square number.

921061801 is the 15175-th centered octagonal number.

It is an amenable number.

921061801 is a deficient number, since it is larger than the sum of its proper divisors (136942958).

921061801 is an equidigital number, since it uses as much as digits as its factorization.

921061801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262 (or 131 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 28.

The cubic root of 921061801 is about 972.9628475065.

The spelling of 921061801 in words is "nine hundred twenty-one million, sixty-one thousand, eight hundred one".