1308697157 has 4 divisors (see below), whose sum is σ = 1311612300. Its totient is φ = 1305782016.

The previous prime is 1308697153. The next prime is 1308697189. The reversal of 1308697157 is 7517968031.

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 851122276 + 457574881 = 29174^2 + 21391^2 .

It is a cyclic number.

It is not a de Polignac number, because 1308697157 - 2² = 1308697153 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 (1308697153) 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, 1456898 + ... + 1457795.

It is an arithmetic number, because the mean of its divisors is an integer number (327903075).

Almost surely, 2^1308697157 is an apocalyptic number.

It is an amenable number.

1308697157 is a deficient number, since it is larger than the sum of its proper divisors (2915143).

1308697157 is an equidigital number, since it uses as much as digits as its factorization.

1308697157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2915142.

The product of its (nonzero) digits is 317520, while the sum is 47.

The square root of 1308697157 is about 36175.9195736612. The cubic root of 1308697157 is about 1093.8213256256.

The spelling of 1308697157 in words is "one billion, three hundred eight million, six hundred ninety-seven thousand, one hundred fifty-seven".