71409157 has 4 divisors (see below), whose sum is σ = 71461600. Its totient is φ = 71356716.

The previous prime is 71409139. The next prime is 71409161. The reversal of 71409157 is 75190417.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75190417 = 29 ⋅2592773.

It is a cyclic number.

It is not a de Polignac number, because 71409157 - 2¹¹ = 71407109 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 (71409187) 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, 24123 + ... + 26920.

It is an arithmetic number, because the mean of its divisors is an integer number (17865400).

Almost surely, 2^71409157 is an apocalyptic number.

It is an amenable number.

71409157 is a deficient number, since it is larger than the sum of its proper divisors (52443).

71409157 is a wasteful number, since it uses less digits than its factorization.

71409157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52442.

The product of its (nonzero) digits is 8820, while the sum is 34.

The square root of 71409157 is about 8450.3938961447. The cubic root of 71409157 is about 414.8756718582.

The spelling of 71409157 in words is "seventy-one million, four hundred nine thousand, one hundred fifty-seven".