139971506902 has 4 divisors (see below), whose sum is σ = 209957260356. Its totient is φ = 69985753450.

The previous prime is 139971506897. The next prime is 139971506903. The reversal of 139971506902 is 209605179931.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 139971506902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139971506903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34992876724 + ... + 34992876727.

It is an arithmetic number, because the mean of its divisors is an integer number (52489315089).

Almost surely, 2^139971506902 is an apocalyptic number.

139971506902 is a deficient number, since it is larger than the sum of its proper divisors (69985753454).

139971506902 is an equidigital number, since it uses as much as digits as its factorization.

139971506902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69985753453.

The product of its (nonzero) digits is 918540, while the sum is 52.

The spelling of 139971506902 in words is "one hundred thirty-nine billion, nine hundred seventy-one million, five hundred six thousand, nine hundred two".