2154235531 has 4 divisors (see below), whose sum is σ = 2461983472. Its totient is φ = 1846487592.

The previous prime is 2154235519. The next prime is 2154235537. The reversal of 2154235531 is 1355324512.

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 2154235531 - 2¹⁹ = 2153711243 is a prime.

It is a super-2 number, since 2×2154235531² = 9281461446045703922, 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 = 2154235493 and 2154235502.

It is not an unprimeable number, because it can be changed into a prime (2154235537) 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, 153873960 + ... + 153873973.

It is an arithmetic number, because the mean of its divisors is an integer number (615495868).

Almost surely, 2^2154235531 is an apocalyptic number.

2154235531 is a deficient number, since it is larger than the sum of its proper divisors (307747941).

2154235531 is an equidigital number, since it uses as much as digits as its factorization.

2154235531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307747940.

The product of its digits is 18000, while the sum is 31.

The square root of 2154235531 is about 46413.7429109095. The cubic root of 2154235531 is about 1291.5098662209.

The spelling of 2154235531 in words is "two billion, one hundred fifty-four million, two hundred thirty-five thousand, five hundred thirty-one".