71550901 has 4 divisors (see below), whose sum is σ = 72900972. Its totient is φ = 70200832.

The previous prime is 71550887. The next prime is 71550931. The reversal of 71550901 is 10905517.

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 29170801 + 42380100 = 5401^2 + 6510^2 .

It is a de Polignac number, because none of the positive numbers 2^k-71550901 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71550901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71550931) 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, 674956 + ... + 675061.

It is an arithmetic number, because the mean of its divisors is an integer number (18225243).

Almost surely, 2^71550901 is an apocalyptic number.

It is an amenable number.

71550901 is a deficient number, since it is larger than the sum of its proper divisors (1350071).

71550901 is a wasteful number, since it uses less digits than its factorization.

71550901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1350070.

The product of its (nonzero) digits is 1575, while the sum is 28.

The square root of 71550901 is about 8458.7765663836. The cubic root of 71550901 is about 415.1499936836.

The spelling of 71550901 in words is "seventy-one million, five hundred fifty thousand, nine hundred one".