1272420241 has 3 divisors (see below), whose sum is σ = 1272455913. Its totient is φ = 1272384570.

The previous prime is 1272420209. The next prime is 1272420251. The reversal of 1272420241 is 1420242721.

The square root of 1272420241 is 35671.

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 1272420241 - 2⁵ = 1272420209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1272420251) 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, 17836 + ... + 53506.

It is an arithmetic number, because the mean of its divisors is an integer number (424151971).

Almost surely, 2^1272420241 is an apocalyptic number.

1272420241 is the 35671-st square number.

1272420241 is the 17836-th centered octagonal number.

It is an amenable number.

1272420241 is a deficient number, since it is larger than the sum of its proper divisors (35672).

1272420241 is an frugal number, since it uses more digits than its factorization.

1272420241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71342 (or 35671 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 25.

The cubic root of 1272420241 is about 1083.6196114640.

Multiplying 1272420241 by its sum of digits (25), we get a square (31810506025 = 178355²).

Adding to 1272420241 its reverse (1420242721), we get a palindrome (2692662962).

The spelling of 1272420241 in words is "one billion, two hundred seventy-two million, four hundred twenty thousand, two hundred forty-one".