2158783397 has 2 divisors, whose sum is σ = 2158783398. Its totient is φ = 2158783396.

The previous prime is 2158783313. The next prime is 2158783399. The reversal of 2158783397 is 7933878512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2135733796 + 23049601 = 46214^2 + 4801^2 .

It is a cyclic number.

It is not a de Polignac number, because 2158783397 - 2⁸ = 2158783141 is a prime.

It is a super-3 number, since 3×2158783397³ (a number of 29 digits) contains 333 as substring.

Together with 2158783399, 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 (2158783399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1079391698 + 1079391699.

It is an arithmetic number, because the mean of its divisors is an integer number (1079391699).

Almost surely, 2^2158783397 is an apocalyptic number.

It is an amenable number.

2158783397 is a deficient number, since it is larger than the sum of its proper divisors (1).

2158783397 is an equidigital number, since it uses as much as digits as its factorization.

2158783397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2540160, while the sum is 53.

The square root of 2158783397 is about 46462.7097466345. The cubic root of 2158783397 is about 1292.4180747632.

The spelling of 2158783397 in words is "two billion, one hundred fifty-eight million, seven hundred eighty-three thousand, three hundred ninety-seven".