213001531 has 2 divisors, whose sum is σ = 213001532. Its totient is φ = 213001530.

The previous prime is 213001511. The next prime is 213001543. The reversal of 213001531 is 135100312.

213001531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213001531 - 2⁵ = 213001499 is a prime.

It is a super-2 number, since 2×213001531² = 90739304416687922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (213001511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106500765 + 106500766.

It is an arithmetic number, because the mean of its divisors is an integer number (106500766).

Almost surely, 2^213001531 is an apocalyptic number.

213001531 is a deficient number, since it is larger than the sum of its proper divisors (1).

213001531 is an equidigital number, since it uses as much as digits as its factorization.

213001531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 213001531 is about 14594.5719704279. The cubic root of 213001531 is about 597.2106928515.

Adding to 213001531 its reverse (135100312), we get a palindrome (348101843).

The spelling of 213001531 in words is "two hundred thirteen million, one thousand, five hundred thirty-one".