157994647 has 2 divisors, whose sum is σ = 157994648. Its totient is φ = 157994646.

The previous prime is 157994623. The next prime is 157994653. The reversal of 157994647 is 746499751.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 157994647 - 2²⁷ = 23776919 is a prime.

It is a super-3 number, since 3×157994647³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 157994594 and 157994603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157994147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78997323 + 78997324.

It is an arithmetic number, because the mean of its divisors is an integer number (78997324).

Almost surely, 2^157994647 is an apocalyptic number.

157994647 is a deficient number, since it is larger than the sum of its proper divisors (1).

157994647 is an equidigital number, since it uses as much as digits as its factorization.

157994647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1905120, while the sum is 52.

The square root of 157994647 is about 12569.5921572659. The cubic root of 157994647 is about 540.6059122400.

The spelling of 157994647 in words is "one hundred fifty-seven million, nine hundred ninety-four thousand, six hundred forty-seven".