1901953381 has 2 divisors, whose sum is σ = 1901953382. Its totient is φ = 1901953380.

The previous prime is 1901953363. The next prime is 1901953453. The reversal of 1901953381 is 1833591091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1837408225 + 64545156 = 42865^2 + 8034^2 .

It is a cyclic number.

It is not a de Polignac number, because 1901953381 - 2⁵ = 1901953349 is a prime.

It is a super-2 number, since 2×1901953381² = 7234853326994662322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1901953301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 950976690 + 950976691.

It is an arithmetic number, because the mean of its divisors is an integer number (950976691).

Almost surely, 2^1901953381 is an apocalyptic number.

It is an amenable number.

1901953381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1901953381 is an equidigital number, since it uses as much as digits as its factorization.

1901953381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29160, while the sum is 40.

The square root of 1901953381 is about 43611.3904960619. The cubic root of 1901953381 is about 1238.9866376084.

The spelling of 1901953381 in words is "one billion, nine hundred one million, nine hundred fifty-three thousand, three hundred eighty-one".