321149531 has 2 divisors, whose sum is σ = 321149532. Its totient is φ = 321149530.

The previous prime is 321149489. The next prime is 321149537. The reversal of 321149531 is 135941123.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 321149531 - 2⁶ = 321149467 is a prime.

It is a super-2 number, since 2×321149531² = 206274042523039922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 321149494 and 321149503.

It is not a weakly prime, because it can be changed into another prime (321149537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160574765 + 160574766.

It is an arithmetic number, because the mean of its divisors is an integer number (160574766).

Almost surely, 2^321149531 is an apocalyptic number.

321149531 is a deficient number, since it is larger than the sum of its proper divisors (1).

321149531 is an equidigital number, since it uses as much as digits as its factorization.

321149531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 29.

The square root of 321149531 is about 17920.6453845837. The cubic root of 321149531 is about 684.8084292112.

The spelling of 321149531 in words is "three hundred twenty-one million, one hundred forty-nine thousand, five hundred thirty-one".