72161701 has 2 divisors, whose sum is σ = 72161702. Its totient is φ = 72161700.

The previous prime is 72161693. The next prime is 72161723. The reversal of 72161701 is 10716127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46253601 + 25908100 = 6801^2 + 5090^2 .

It is a cyclic number.

It is not a de Polignac number, because 72161701 - 2³ = 72161693 is a prime.

It is a super-2 number, since 2×72161701² = 10414622182426802, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72161801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36080850 + 36080851.

It is an arithmetic number, because the mean of its divisors is an integer number (36080851).

Almost surely, 2^72161701 is an apocalyptic number.

It is an amenable number.

72161701 is a deficient number, since it is larger than the sum of its proper divisors (1).

72161701 is an equidigital number, since it uses as much as digits as its factorization.

72161701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 588, while the sum is 25.

The square root of 72161701 is about 8494.8043532503. The cubic root of 72161701 is about 416.3279684528.

Adding to 72161701 its reverse (10716127), we get a palindrome (82877828).

The spelling of 72161701 in words is "seventy-two million, one hundred sixty-one thousand, seven hundred one".