72542551 has 4 divisors (see below), whose sum is σ = 76360600. Its totient is φ = 68724504.

The previous prime is 72542521. The next prime is 72542557. The reversal of 72542551 is 15524527.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72542551 - 2¹⁵ = 72509783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72542557) 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, 1908996 + ... + 1909033.

It is an arithmetic number, because the mean of its divisors is an integer number (19090150).

Almost surely, 2^72542551 is an apocalyptic number.

72542551 is a deficient number, since it is larger than the sum of its proper divisors (3818049).

72542551 is a wasteful number, since it uses less digits than its factorization.

72542551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3818048.

The product of its digits is 14000, while the sum is 31.

The square root of 72542551 is about 8517.1914972014. The cubic root of 72542551 is about 417.0591059611.

The spelling of 72542551 in words is "seventy-two million, five hundred forty-two thousand, five hundred fifty-one".