1201213381 has 2 divisors, whose sum is σ = 1201213382. Its totient is φ = 1201213380.

The previous prime is 1201213373. The next prime is 1201213393. The reversal of 1201213381 is 1833121021.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 817445281 + 383768100 = 28591^2 + 19590^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201213381 - 2³ = 1201213373 is a prime.

It is a super-2 number, since 2×1201213381² = 2885827173386902322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201213781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600606690 + 600606691.

It is an arithmetic number, because the mean of its divisors is an integer number (600606691).

Almost surely, 2^1201213381 is an apocalyptic number.

It is an amenable number.

1201213381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201213381 is an equidigital number, since it uses as much as digits as its factorization.

1201213381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 1201213381 is about 34658.5253725544. The cubic root of 1201213381 is about 1063.0166178952.

The spelling of 1201213381 in words is "one billion, two hundred one million, two hundred thirteen thousand, three hundred eighty-one".