1356781137 has 4 divisors (see below), whose sum is σ = 1809041520. Its totient is φ = 904520756.

The previous prime is 1356781121. The next prime is 1356781141. The reversal of 1356781137 is 7311876531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1356781137 - 2⁴ = 1356781121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1356781147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226130187 + ... + 226130192.

It is an arithmetic number, because the mean of its divisors is an integer number (452260380).

Almost surely, 2^1356781137 is an apocalyptic number.

It is an amenable number.

1356781137 is a deficient number, since it is larger than the sum of its proper divisors (452260383).

1356781137 is an equidigital number, since it uses as much as digits as its factorization.

1356781137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452260382.

The product of its digits is 105840, while the sum is 42.

The square root of 1356781137 is about 36834.5101365554. The cubic root of 1356781137 is about 1107.0568725580.

The spelling of 1356781137 in words is "one billion, three hundred fifty-six million, seven hundred eighty-one thousand, one hundred thirty-seven".