19149157 has 4 divisors (see below), whose sum is σ = 20275596. Its totient is φ = 18022720.

The previous prime is 19149149. The next prime is 19149161. The reversal of 19149157 is 75194191.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7322436 + 11826721 = 2706^2 + 3439^2 .

It is not a de Polignac number, because 19149157 - 2³ = 19149149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19149167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 563194 + ... + 563227.

It is an arithmetic number, because the mean of its divisors is an integer number (5068899).

Almost surely, 2^19149157 is an apocalyptic number.

19149157 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

19149157 is a deficient number, since it is larger than the sum of its proper divisors (1126439).

19149157 is a wasteful number, since it uses less digits than its factorization.

19149157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1126438.

The product of its digits is 11340, while the sum is 37.

The square root of 19149157 is about 4375.9749770765. The cubic root of 19149157 is about 267.5366101231.

It can be divided in two parts, 19149 and 157, that added together give a triangular number (19306 = T₁₉₆).

The spelling of 19149157 in words is "nineteen million, one hundred forty-nine thousand, one hundred fifty-seven".