139217211 has 20 divisors (see below), whose sum is σ = 237676912. Its totient is φ = 79552368.

The previous prime is 139217203. The next prime is 139217219. The reversal of 139217211 is 112712931.

139217211 = 274² + 275² + ... + 759².

It is an interprime number because it is at equal distance from previous prime (139217203) and next prime (139217219).

It is not a de Polignac number, because 139217211 - 2³ = 139217203 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139217219) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 122200 + ... + 123333.

Almost surely, 2^139217211 is an apocalyptic number.

139217211 is a deficient number, since it is larger than the sum of its proper divisors (98459701).

139217211 is an equidigital number, since it uses as much as digits as its factorization.

139217211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245552 (or 245543 counting only the distinct ones).

The product of its digits is 756, while the sum is 27.

The square root of 139217211 is about 11799.0343248929. The cubic root of 139217211 is about 518.2798324541.

The spelling of 139217211 in words is "one hundred thirty-nine million, two hundred seventeen thousand, two hundred eleven".