157540717 has 4 divisors (see below), whose sum is σ = 166807836. Its totient is φ = 148273600.

The previous prime is 157540699. The next prime is 157540727. The reversal of 157540717 is 717045751.

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 91183401 + 66357316 = 9549^2 + 8146^2 .

It is a cyclic number.

It is not a de Polignac number, because 157540717 - 2⁷ = 157540589 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 (157540727) 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, 4633534 + ... + 4633567.

It is an arithmetic number, because the mean of its divisors is an integer number (41701959).

Almost surely, 2^157540717 is an apocalyptic number.

157540717 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

157540717 is a deficient number, since it is larger than the sum of its proper divisors (9267119).

157540717 is an equidigital number, since it uses as much as digits as its factorization.

157540717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9267118.

The product of its (nonzero) digits is 34300, while the sum is 37.

The square root of 157540717 is about 12551.5224972909. The cubic root of 157540717 is about 540.0876823782.

The spelling of 157540717 in words is "one hundred fifty-seven million, five hundred forty thousand, seven hundred seventeen".