1240231381 has 2 divisors, whose sum is σ = 1240231382. Its totient is φ = 1240231380.

The previous prime is 1240231373. The next prime is 1240231459. The reversal of 1240231381 is 1831320421.

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., 1220384356 + 19847025 = 34934^2 + 4455^2 .

It is a cyclic number.

It is not a de Polignac number, because 1240231381 - 2³ = 1240231373 is a prime.

It is a super-2 number, since 2×1240231381² = 3076347756834334322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240231301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620115690 + 620115691.

It is an arithmetic number, because the mean of its divisors is an integer number (620115691).

Almost surely, 2^1240231381 is an apocalyptic number.

It is an amenable number.

1240231381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240231381 is an equidigital number, since it uses as much as digits as its factorization.

1240231381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 1240231381 is about 35216.9189595001. The cubic root of 1240231381 is about 1074.4038897325.

The spelling of 1240231381 in words is "one billion, two hundred forty million, two hundred thirty-one thousand, three hundred eighty-one".