1011123431 has 4 divisors (see below), whose sum is σ = 1018504032. Its totient is φ = 1003742832.

The previous prime is 1011123403. The next prime is 1011123461. The reversal of 1011123431 is 1343211101.

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 1011123431 - 2¹⁴ = 1011107047 is a prime.

It is a super-2 number, since 2×1011123431² = 2044741185434423522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011123461) 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, 3690095 + ... + 3690368.

It is an arithmetic number, because the mean of its divisors is an integer number (254626008).

Almost surely, 2^1011123431 is an apocalyptic number.

1011123431 is a deficient number, since it is larger than the sum of its proper divisors (7380601).

1011123431 is an equidigital number, since it uses as much as digits as its factorization.

1011123431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7380600.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1011123431 is about 31798.1671012654. The cubic root of 1011123431 is about 1003.6941468084.

Adding to 1011123431 its reverse (1343211101), we get a palindrome (2354334532).

The spelling of 1011123431 in words is "one billion, eleven million, one hundred twenty-three thousand, four hundred thirty-one".