921618901 has 24 divisors (see below), whose sum is σ = 1122920064. Its totient is φ = 752764320.

The previous prime is 921618889. The next prime is 921618917. The reversal of 921618901 is 109816129.

It is a de Polignac number, because none of the positive numbers 2^k-921618901 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921618931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 328816 + ... + 331606.

It is an arithmetic number, because the mean of its divisors is an integer number (46788336).

Almost surely, 2^921618901 is an apocalyptic number.

It is an amenable number.

921618901 is a deficient number, since it is larger than the sum of its proper divisors (201301163).

921618901 is a wasteful number, since it uses less digits than its factorization.

921618901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3121 (or 3114 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 37.

The square root of 921618901 is about 30358.1768391977. The cubic root of 921618901 is about 973.1589720067.

The spelling of 921618901 in words is "nine hundred twenty-one million, six hundred eighteen thousand, nine hundred one".