19513157 has 2 divisors, whose sum is σ = 19513158. Its totient is φ = 19513156.

The previous prime is 19513141. The next prime is 19513159. The reversal of 19513157 is 75131591.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16394401 + 3118756 = 4049^2 + 1766^2 .

It is a cyclic number.

It is not a de Polignac number, because 19513157 - 2⁴ = 19513141 is a prime.

It is a super-2 number, since 2×19513157² = 761526592213298, which contains 22 as substring.

Together with 19513159, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19513159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9756578 + 9756579.

It is an arithmetic number, because the mean of its divisors is an integer number (9756579).

Almost surely, 2^19513157 is an apocalyptic number.

It is an amenable number.

19513157 is a deficient number, since it is larger than the sum of its proper divisors (1).

19513157 is an equidigital number, since it uses as much as digits as its factorization.

19513157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4725, while the sum is 32.

The square root of 19513157 is about 4417.3699188544. The cubic root of 19513157 is about 269.2211528308.

The spelling of 19513157 in words is "nineteen million, five hundred thirteen thousand, one hundred fifty-seven".