345612181 has 2 divisors, whose sum is σ = 345612182. Its totient is φ = 345612180.

The previous prime is 345612143. The next prime is 345612217. The reversal of 345612181 is 181216543.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 314352900 + 31259281 = 17730^2 + 5591^2 .

It is a cyclic number.

It is not a de Polignac number, because 345612181 - 2¹³ = 345603989 is a prime.

It is a super-2 number, since 2×345612181² = 238895559311153522, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (345612131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172806090 + 172806091.

It is an arithmetic number, because the mean of its divisors is an integer number (172806091).

Almost surely, 2^345612181 is an apocalyptic number.

It is an amenable number.

345612181 is a deficient number, since it is larger than the sum of its proper divisors (1).

345612181 is an equidigital number, since it uses as much as digits as its factorization.

345612181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 31.

The square root of 345612181 is about 18590.6476756459. The cubic root of 345612181 is about 701.7725018566.

The spelling of 345612181 in words is "three hundred forty-five million, six hundred twelve thousand, one hundred eighty-one".