1248091381 has 2 divisors, whose sum is σ = 1248091382. Its totient is φ = 1248091380.

The previous prime is 1248091349. The next prime is 1248091387. The reversal of 1248091381 is 1831908421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 699126481 + 548964900 = 26441^2 + 23430^2 .

It is a cyclic number.

It is not a de Polignac number, because 1248091381 - 2⁵ = 1248091349 is a prime.

It is a super-2 number, since 2×1248091381² = 3115464190652974322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1248091381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1248091387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624045690 + 624045691.

It is an arithmetic number, because the mean of its divisors is an integer number (624045691).

Almost surely, 2^1248091381 is an apocalyptic number.

It is an amenable number.

1248091381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1248091381 is an equidigital number, since it uses as much as digits as its factorization.

1248091381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 1248091381 is about 35328.3367992324. The cubic root of 1248091381 is about 1076.6687997329.

The spelling of 1248091381 in words is "one billion, two hundred forty-eight million, ninety-one thousand, three hundred eighty-one".