71649001 has 4 divisors (see below), whose sum is σ = 71675604. Its totient is φ = 71622400.

The previous prime is 71648987. The next prime is 71649013. The reversal of 71649001 is 10094617.

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 47403225 + 24245776 = 6885^2 + 4924^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71649001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71649041) 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, 8740 + ... + 14821.

It is an arithmetic number, because the mean of its divisors is an integer number (17918901).

Almost surely, 2^71649001 is an apocalyptic number.

It is an amenable number.

71649001 is a deficient number, since it is larger than the sum of its proper divisors (26603).

71649001 is a wasteful number, since it uses less digits than its factorization.

71649001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26602.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 71649001 is about 8464.5732910762. The cubic root of 71649001 is about 415.3396377710.

The spelling of 71649001 in words is "seventy-one million, six hundred forty-nine thousand, one".