72135491 has 4 divisors (see below), whose sum is σ = 73496592. Its totient is φ = 70774392.

The previous prime is 72135473. The next prime is 72135493. The reversal of 72135491 is 19453127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19453127 = 2267 ⋅8581.

It is a cyclic number.

It is not a de Polignac number, because 72135491 - 2¹⁴ = 72119107 is a prime.

It is a super-2 number, since 2×72135491² = 10407058123622162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72135493) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 680471 + ... + 680576.

It is an arithmetic number, because the mean of its divisors is an integer number (18374148).

Almost surely, 2^72135491 is an apocalyptic number.

72135491 is a deficient number, since it is larger than the sum of its proper divisors (1361101).

72135491 is a wasteful number, since it uses less digits than its factorization.

72135491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1361100.

The product of its digits is 7560, while the sum is 32.

The square root of 72135491 is about 8493.2615054524. The cubic root of 72135491 is about 416.2775572361.

The spelling of 72135491 in words is "seventy-two million, one hundred thirty-five thousand, four hundred ninety-one".