1372556261 has 2 divisors, whose sum is σ = 1372556262. Its totient is φ = 1372556260.

The previous prime is 1372556239. The next prime is 1372556281. The reversal of 1372556261 is 1626552731.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1370850625 + 1705636 = 37025^2 + 1306^2 .

It is an emirp because it is prime and its reverse (1626552731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1372556261 - 2¹⁴ = 1372539877 is a prime.

It is a super-2 number, since 2×1372556261² = 3767821379220600242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1372556281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 686278130 + 686278131.

It is an arithmetic number, because the mean of its divisors is an integer number (686278131).

Almost surely, 2^1372556261 is an apocalyptic number.

It is an amenable number.

1372556261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1372556261 is an equidigital number, since it uses as much as digits as its factorization.

1372556261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 38.

The square root of 1372556261 is about 37048.0264116727. The cubic root of 1372556261 is about 1111.3308877363.

The spelling of 1372556261 in words is "one billion, three hundred seventy-two million, five hundred fifty-six thousand, two hundred sixty-one".