191381464 has 32 divisors (see below), whose sum is σ = 369770400. Its totient is φ = 92793600.

The previous prime is 191381441. The next prime is 191381467. The reversal of 191381464 is 464183191.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191381467) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105364 + ... + 107164.

It is an arithmetic number, because the mean of its divisors is an integer number (11555325).

Almost surely, 2^191381464 is an apocalyptic number.

It is an amenable number.

191381464 is a deficient number, since it is larger than the sum of its proper divisors (178388936).

191381464 is a wasteful number, since it uses less digits than its factorization.

191381464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2203 (or 2199 counting only the distinct ones).

The product of its digits is 20736, while the sum is 37.

The square root of 191381464 is about 13834.0689603601. The cubic root of 191381464 is about 576.2796594010.

It can be divided in two parts, 19138 and 1464, that added together give a palindrome (20602).

The spelling of 191381464 in words is "one hundred ninety-one million, three hundred eighty-one thousand, four hundred sixty-four".