1137991693 has 2 divisors, whose sum is σ = 1137991694. Its totient is φ = 1137991692.

The previous prime is 1137991667. The next prime is 1137991739. The reversal of 1137991693 is 3961997311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1055145289 + 82846404 = 32483^2 + 9102^2 .

It is a cyclic number.

It is not a de Polignac number, because 1137991693 - 2¹³ = 1137983501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1137991663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 568995846 + 568995847.

It is an arithmetic number, because the mean of its divisors is an integer number (568995847).

Almost surely, 2^1137991693 is an apocalyptic number.

It is an amenable number.

1137991693 is a deficient number, since it is larger than the sum of its proper divisors (1).

1137991693 is an equidigital number, since it uses as much as digits as its factorization.

1137991693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 275562, while the sum is 49.

The square root of 1137991693 is about 33734.1324625371. The cubic root of 1137991693 is about 1044.0301259760.

The spelling of 1137991693 in words is "one billion, one hundred thirty-seven million, nine hundred ninety-one thousand, six hundred ninety-three".