921987601 has 2 divisors, whose sum is σ = 921987602. Its totient is φ = 921987600.

The previous prime is 921987593. The next prime is 921987607. The reversal of 921987601 is 106789129.

921987601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 591656976 + 330330625 = 24324^2 + 18175^2 .

It is a cyclic number.

It is not a de Polignac number, because 921987601 - 2³ = 921987593 is a prime.

It is a super-2 number, since 2×921987601² = 1700122272795470402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (921987607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460993800 + 460993801.

It is an arithmetic number, because the mean of its divisors is an integer number (460993801).

Almost surely, 2^921987601 is an apocalyptic number.

It is an amenable number.

921987601 is a deficient number, since it is larger than the sum of its proper divisors (1).

921987601 is an equidigital number, since it uses as much as digits as its factorization.

921987601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 43.

The square root of 921987601 is about 30364.2487310324. The cubic root of 921987601 is about 973.2887276920.

It can be divided in two parts, 92198 and 7601, that added together give a palindrome (99799).

The spelling of 921987601 in words is "nine hundred twenty-one million, nine hundred eighty-seven thousand, six hundred one".