72151431 has 16 divisors (see below), whose sum is σ = 107509248. Its totient is φ = 42660800.

The previous prime is 72151423. The next prime is 72151441. The reversal of 72151431 is 13415127.

It is a cyclic number.

It is not a de Polignac number, because 72151431 - 2³ = 72151423 is a prime.

It is a super-2 number, since 2×72151431² = 10411657990695522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72151421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25311 + ... + 28016.

It is an arithmetic number, because the mean of its divisors is an integer number (6719328).

Almost surely, 2^72151431 is an apocalyptic number.

72151431 is a deficient number, since it is larger than the sum of its proper divisors (35357817).

72151431 is a wasteful number, since it uses less digits than its factorization.

72151431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53382.

The product of its digits is 840, while the sum is 24.

The square root of 72151431 is about 8494.1998445998. The cubic root of 72151431 is about 416.3082170194.

Adding to 72151431 its reverse (13415127), we get a palindrome (85566558).

It can be divided in two parts, 7215 and 1431, that added together give a triangular number (8646 = T₁₃₁).

The spelling of 72151431 in words is "seventy-two million, one hundred fifty-one thousand, four hundred thirty-one".