921493951 has 12 divisors (see below), whose sum is σ = 1081966248. Its totient is φ = 782465712.

The previous prime is 921493949. The next prime is 921493981. The reversal of 921493951 is 159394129.

It is not a de Polignac number, because 921493951 - 2¹ = 921493949 is a prime.

It is a super-2 number, since 2×921493951² = 1698302203459180802, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 921493898 and 921493907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921493981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82636 + ... + 93121.

It is an arithmetic number, because the mean of its divisors is an integer number (90163854).

Almost surely, 2^921493951 is an apocalyptic number.

921493951 is a deficient number, since it is larger than the sum of its proper divisors (160472297).

921493951 is a wasteful number, since it uses less digits than its factorization.

921493951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175878 (or 175871 counting only the distinct ones).

The product of its digits is 87480, while the sum is 43.

The square root of 921493951 is about 30356.1188395355. The cubic root of 921493951 is about 973.1149908090.

It can be divided in two parts, 92149 and 3951, that added together give a square (96100 = 310²).

The spelling of 921493951 in words is "nine hundred twenty-one million, four hundred ninety-three thousand, nine hundred fifty-one".