1377222491 has 2 divisors, whose sum is σ = 1377222492. Its totient is φ = 1377222490.

The previous prime is 1377222487. The next prime is 1377222541. The reversal of 1377222491 is 1942227731.

It is a weak prime.

It is an emirp because it is prime and its reverse (1942227731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1377222491 - 2² = 1377222487 is a prime.

It is not a weakly prime, because it can be changed into another prime (1377222421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 688611245 + 688611246.

It is an arithmetic number, because the mean of its divisors is an integer number (688611246).

Almost surely, 2^1377222491 is an apocalyptic number.

1377222491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1377222491 is an equidigital number, since it uses as much as digits as its factorization.

1377222491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 38.

The square root of 1377222491 is about 37110.9483980132. The cubic root of 1377222491 is about 1112.5888471062.

It can be divided in two parts, 13772 and 22491, that added together give a palindrome (36263).

The spelling of 1377222491 in words is "one billion, three hundred seventy-seven million, two hundred twenty-two thousand, four hundred ninety-one".