1587138797 has 2 divisors, whose sum is σ = 1587138798. Its totient is φ = 1587138796.

The previous prime is 1587138769. The next prime is 1587138821. The reversal of 1587138797 is 7978317851.

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., 1584517636 + 2621161 = 39806^2 + 1619^2 .

It is a cyclic number.

It is not a de Polignac number, because 1587138797 - 2¹⁴ = 1587122413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1587138727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 793569398 + 793569399.

It is an arithmetic number, because the mean of its divisors is an integer number (793569399).

Almost surely, 2^1587138797 is an apocalyptic number.

It is an amenable number.

1587138797 is a deficient number, since it is larger than the sum of its proper divisors (1).

1587138797 is an equidigital number, since it uses as much as digits as its factorization.

1587138797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2963520, while the sum is 56.

The square root of 1587138797 is about 39838.9105900249. The cubic root of 1587138797 is about 1166.4647951760.

The spelling of 1587138797 in words is "one billion, five hundred eighty-seven million, one hundred thirty-eight thousand, seven hundred ninety-seven".