213271731 has 16 divisors (see below), whose sum is σ = 318236800. Its totient is φ = 141155784.

The previous prime is 213271727. The next prime is 213271769. The reversal of 213271731 is 137172312.

213271731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 213271731 - 2² = 213271727 is a prime.

It is a super-2 number, since 2×213271731² = 90969662487472722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213271695 and 213271704.

It is not an unprimeable number, because it can be changed into a prime (213271711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24661 + ... + 32166.

It is an arithmetic number, because the mean of its divisors is an integer number (19889800).

Almost surely, 2^213271731 is an apocalyptic number.

213271731 is a deficient number, since it is larger than the sum of its proper divisors (104965069).

213271731 is a wasteful number, since it uses less digits than its factorization.

213271731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56975 (or 56969 counting only the distinct ones).

The product of its digits is 1764, while the sum is 27.

The square root of 213271731 is about 14603.8259028242. The cubic root of 213271731 is about 597.4631137981.

The spelling of 213271731 in words is "two hundred thirteen million, two hundred seventy-one thousand, seven hundred thirty-one".