1552191381 has 24 divisors (see below), whose sum is σ = 2439429720. Its totient is φ = 945340416.

The previous prime is 1552191367. The next prime is 1552191413. The reversal of 1552191381 is 1831912551.

1552191381 is a `hidden beast` number, since 1 + 552 + 19 + 13 + 81 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 70711281 + 1481480100 = 8409^2 + 38490^2 .

It is not a de Polignac number, because 1552191381 - 2⁵ = 1552191349 is a prime.

It is a super-2 number, since 2×1552191381² = 4818596166501374322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1552191581) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57036 + ... + 79733.

It is an arithmetic number, because the mean of its divisors is an integer number (101642905).

Almost surely, 2^1552191381 is an apocalyptic number.

It is an amenable number.

1552191381 is a deficient number, since it is larger than the sum of its proper divisors (887238339).

1552191381 is a wasteful number, since it uses less digits than its factorization.

1552191381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136885 (or 136882 counting only the distinct ones).

The product of its digits is 10800, while the sum is 36.

The square root of 1552191381 is about 39397.8601068637. The cubic root of 1552191381 is about 1157.8396625349.

The spelling of 1552191381 in words is "one billion, five hundred fifty-two million, one hundred ninety-one thousand, three hundred eighty-one".