72101897 has 4 divisors (see below), whose sum is σ = 82402176. Its totient is φ = 61801620.

The previous prime is 72101857. The next prime is 72101951. The reversal of 72101897 is 79810127.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72101897 - 2¹⁸ = 71839753 is a prime.

It is a super-4 number, since 4×72101897⁴ (a number of 33 digits) contains 4444 as substring.

It is a Duffinian number.

72101897 is a modest number, since divided by 1897 gives 721 as remainder.

It is not an unprimeable number, because it can be changed into a prime (72101857) 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, 5150129 + ... + 5150142.

It is an arithmetic number, because the mean of its divisors is an integer number (20600544).

Almost surely, 2^72101897 is an apocalyptic number.

It is an amenable number.

72101897 is a deficient number, since it is larger than the sum of its proper divisors (10300279).

72101897 is a wasteful number, since it uses less digits than its factorization.

72101897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10300278.

The product of its (nonzero) digits is 7056, while the sum is 35.

The square root of 72101897 is about 8491.2835896583. The cubic root of 72101897 is about 416.2129260839.

The spelling of 72101897 in words is "seventy-two million, one hundred one thousand, eight hundred ninety-seven".