137572217 has 4 divisors (see below), whose sum is σ = 144812880. Its totient is φ = 130331556.

The previous prime is 137572207. The next prime is 137572229. The reversal of 137572217 is 712275731.

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, and also an emirpimes, since its reverse is a distinct semiprime: 712275731 = 541 ⋅1316591.

It is a cyclic number.

It is not a de Polignac number, because 137572217 - 2¹⁰ = 137571193 is a prime.

It is a super-2 number, since 2×137572217² = 37852229780590178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137572207) 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, 3620303 + ... + 3620340.

It is an arithmetic number, because the mean of its divisors is an integer number (36203220).

Almost surely, 2^137572217 is an apocalyptic number.

It is an amenable number.

137572217 is a deficient number, since it is larger than the sum of its proper divisors (7240663).

137572217 is an equidigital number, since it uses as much as digits as its factorization.

137572217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7240662.

The product of its digits is 20580, while the sum is 35.

The square root of 137572217 is about 11729.1183385624. The cubic root of 137572217 is about 516.2304033350.

The spelling of 137572217 in words is "one hundred thirty-seven million, five hundred seventy-two thousand, two hundred seventeen".