72171403 has 2 divisors, whose sum is σ = 72171404. Its totient is φ = 72171402.

The previous prime is 72171389. The next prime is 72171413. The reversal of 72171403 is 30417127.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72171403 - 2¹³ = 72163211 is a prime.

It is a super-2 number, since 2×72171403² = 10417422821976818, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72171413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36085701 + 36085702.

It is an arithmetic number, because the mean of its divisors is an integer number (36085702).

Almost surely, 2^72171403 is an apocalyptic number.

72171403 is a deficient number, since it is larger than the sum of its proper divisors (1).

72171403 is an equidigital number, since it uses as much as digits as its factorization.

72171403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 72171403 is about 8495.3753889984. The cubic root of 72171403 is about 416.3466257779.

The spelling of 72171403 in words is "seventy-two million, one hundred seventy-one thousand, four hundred three".