139770551881 has 3 divisors (see below), whose sum is σ = 139770925741. Its totient is φ = 139770178022.

The previous prime is 139770551867. The next prime is 139770551909. The reversal of 139770551881 is 188155077931.

The square root of 139770551881 is 373859.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 139770551881 - 2²¹ = 139768454729 is a prime.

It is a super-2 number, since 2×139770551881² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139770551381) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 186930 + ... + 560788.

Almost surely, 2^139770551881 is an apocalyptic number.

139770551881 is the 373859-th square number.

139770551881 is the 186930-th centered octagonal number.

It is an amenable number.

139770551881 is a deficient number, since it is larger than the sum of its proper divisors (373860).

139770551881 is an frugal number, since it uses more digits than its factorization.

139770551881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 747718 (or 373859 counting only the distinct ones).

The product of its (nonzero) digits is 2116800, while the sum is 55.

The spelling of 139770551881 in words is "one hundred thirty-nine billion, seven hundred seventy million, five hundred fifty-one thousand, eight hundred eighty-one".