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991122431 = 1376240187
BaseRepresentation
bin111011000100110…
…101001111111111
32120001222020101012
4323010311033333
54012211404211
6242203105435
733363254525
oct7304651777
92501866335
10991122431
1146950aa52
12237b1227b
1312a44c4a0
14958ba315
155c02ad8b
hex3b1353ff

991122431 has 4 divisors (see below), whose sum is σ = 1067362632. Its totient is φ = 914882232.

The previous prime is 991122401. The next prime is 991122497. The reversal of 991122431 is 134221199.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 991122431 - 210 = 991121407 is a prime.

It is a super-2 number, since 2×9911224312 = 1964647346462699522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991122401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38120081 + ... + 38120106.

It is an arithmetic number, because the mean of its divisors is an integer number (266840658).

Almost surely, 2991122431 is an apocalyptic number.

991122431 is a deficient number, since it is larger than the sum of its proper divisors (76240201).

991122431 is a wasteful number, since it uses less digits than its factorization.

991122431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76240200.

The product of its digits is 3888, while the sum is 32.

The square root of 991122431 is about 31482.0969917825. The cubic root of 991122431 is about 997.0320100842.

The spelling of 991122431 in words is "nine hundred ninety-one million, one hundred twenty-two thousand, four hundred thirty-one".

Divisors: 1 13 76240187 991122431