123572637841 has 3 divisors (see below), whose sum is σ = 123572989371. Its totient is φ = 123572286312.

The previous prime is 123572637833. The next prime is 123572637863. The reversal of 123572637841 is 148736275321.

The square root of 123572637841 is 351529.

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 can be written as a sum of positive squares in only one way, i.e., 103215055441 + 20357582400 = 321271^2 + 142680^2 .

It is not a de Polignac number, because 123572637841 - 2³ = 123572637833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123572637641) 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, 175765 + ... + 527293.

It is an arithmetic number, because the mean of its divisors is an integer number (41190996457).

Almost surely, 2^123572637841 is an apocalyptic number.

123572637841 is the 351529-th square number.

123572637841 is the 175765-th centered octagonal number.

It is an amenable number.

123572637841 is a deficient number, since it is larger than the sum of its proper divisors (351530).

123572637841 is an frugal number, since it uses more digits than its factorization.

123572637841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 703058 (or 351529 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 49.

Multiplying 123572637841 by its sum of digits (49), we get a square (6055059254209 = 2460703²).

The spelling of 123572637841 in words is "one hundred twenty-three billion, five hundred seventy-two million, six hundred thirty-seven thousand, eight hundred forty-one".