71503813 has 2 divisors, whose sum is σ = 71503814. Its totient is φ = 71503812.

The previous prime is 71503741. The next prime is 71503823. The reversal of 71503813 is 31830517.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64754209 + 6749604 = 8047^2 + 2598^2 .

It is a cyclic number.

It is not a de Polignac number, because 71503813 - 2¹³ = 71495621 is a prime.

It is a super-2 number, since 2×71503813² = 10225590547077938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71503823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35751906 + 35751907.

It is an arithmetic number, because the mean of its divisors is an integer number (35751907).

Almost surely, 2^71503813 is an apocalyptic number.

It is an amenable number.

71503813 is a deficient number, since it is larger than the sum of its proper divisors (1).

71503813 is an equidigital number, since it uses as much as digits as its factorization.

71503813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 71503813 is about 8455.9927270546. The cubic root of 71503813 is about 415.0589029471.

The spelling of 71503813 in words is "seventy-one million, five hundred three thousand, eight hundred thirteen".