1225437391 has 2 divisors, whose sum is σ = 1225437392. Its totient is φ = 1225437390.

The previous prime is 1225437371. The next prime is 1225437407. The reversal of 1225437391 is 1937345221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1225437391 - 2⁵ = 1225437359 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1225437391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1225437341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612718695 + 612718696.

It is an arithmetic number, because the mean of its divisors is an integer number (612718696).

Almost surely, 2^1225437391 is an apocalyptic number.

1225437391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225437391 is an equidigital number, since it uses as much as digits as its factorization.

1225437391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 37.

The square root of 1225437391 is about 35006.2478851990. The cubic root of 1225437391 is about 1070.1148131377.

The spelling of 1225437391 in words is "one billion, two hundred twenty-five million, four hundred thirty-seven thousand, three hundred ninety-one".