213545997 has 32 divisors (see below), whose sum is σ = 380595200. Its totient is φ = 115601904.

The previous prime is 213545989. The next prime is 213546001. The reversal of 213545997 is 799545312.

It is a happy number.

213545997 is a `hidden beast` number, since 2 + 1 + 3 + 54 + 599 + 7 = 666.

213545997 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 213545997 - 2³ = 213545989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213545197) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26143 + ... + 33324.

It is an arithmetic number, because the mean of its divisors is an integer number (11893600).

Almost surely, 2^213545997 is an apocalyptic number.

213545997 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

213545997 is a deficient number, since it is larger than the sum of its proper divisors (167049203).

213545997 is a wasteful number, since it uses less digits than its factorization.

213545997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59502 (or 59496 counting only the distinct ones).

The product of its digits is 340200, while the sum is 45.

The square root of 213545997 is about 14613.2130963727. The cubic root of 213545997 is about 597.7191152619.

The spelling of 213545997 in words is "two hundred thirteen million, five hundred forty-five thousand, nine hundred ninety-seven".