157442069 has 4 divisors (see below), whose sum is σ = 157468620. Its totient is φ = 157415520.

The previous prime is 157442063. The next prime is 157442071. The reversal of 157442069 is 960244751.

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 110355025 + 47087044 = 10505^2 + 6862^2 .

It is a cyclic number.

It is not a de Polignac number, because 157442069 - 2²⁰ = 156393493 is a prime.

It is a super-2 number, since 2×157442069² = 49576010182001522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157442063) 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, 137 + ... + 17745.

It is an arithmetic number, because the mean of its divisors is an integer number (39367155).

Almost surely, 2^157442069 is an apocalyptic number.

It is an amenable number.

157442069 is a deficient number, since it is larger than the sum of its proper divisors (26551).

157442069 is an equidigital number, since it uses as much as digits as its factorization.

157442069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26550.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 157442069 is about 12547.5921594543. The cubic root of 157442069 is about 539.9749291058.

The spelling of 157442069 in words is "one hundred fifty-seven million, four hundred forty-two thousand, sixty-nine".