71513613541 has 2 divisors, whose sum is σ = 71513613542. Its totient is φ = 71513613540.

The previous prime is 71513613487. The next prime is 71513613547. The reversal of 71513613541 is 14531631517.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67176864225 + 4336749316 = 259185^2 + 65854^2 .

It is a cyclic number.

It is not a de Polignac number, because 71513613541 - 2²¹ = 71511516389 is a prime.

It is a super-2 number, since 2×71513613541² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 71513613541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71513613547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35756806770 + 35756806771.

It is an arithmetic number, because the mean of its divisors is an integer number (35756806771).

Almost surely, 2^71513613541 is an apocalyptic number.

It is an amenable number.

71513613541 is a deficient number, since it is larger than the sum of its proper divisors (1).

71513613541 is an equidigital number, since it uses as much as digits as its factorization.

71513613541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37800, while the sum is 37.

The spelling of 71513613541 in words is "seventy-one billion, five hundred thirteen million, six hundred thirteen thousand, five hundred forty-one".