71974145 has 4 divisors (see below), whose sum is σ = 86368980. Its totient is φ = 57579312.

The previous prime is 71974129. The next prime is 71974181. The reversal of 71974145 is 54147917.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54147917 = 31 ⋅1746707.

It can be written as a sum of positive squares in 2 ways, for example, as 8596624 + 63377521 = 2932^2 + 7961^2 .

It is a cyclic number.

It is not a de Polignac number, because 71974145 - 2⁴ = 71974129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71974099 and 71974108.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7197410 + ... + 7197419.

It is an arithmetic number, because the mean of its divisors is an integer number (21592245).

Almost surely, 2^71974145 is an apocalyptic number.

It is an amenable number.

71974145 is a deficient number, since it is larger than the sum of its proper divisors (14394835).

71974145 is a wasteful number, since it uses less digits than its factorization.

71974145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14394834.

The product of its digits is 35280, while the sum is 38.

The square root of 71974145 is about 8483.7577169554. The cubic root of 71974145 is about 415.9669618270.

The spelling of 71974145 in words is "seventy-one million, nine hundred seventy-four thousand, one hundred forty-five".