1315722637 has 2 divisors, whose sum is σ = 1315722638. Its totient is φ = 1315722636.

The previous prime is 1315722631. The next prime is 1315722641. The reversal of 1315722637 is 7362275131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1299674601 + 16048036 = 36051^2 + 4006^2 .

It is a cyclic number.

It is not a de Polignac number, because 1315722637 - 2¹⁹ = 1315198349 is a prime.

It is a super-2 number, since 2×1315722637² = 3462252115028467538, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1315722596 and 1315722605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1315722631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 657861318 + 657861319.

It is an arithmetic number, because the mean of its divisors is an integer number (657861319).

Almost surely, 2^1315722637 is an apocalyptic number.

It is an amenable number.

1315722637 is a deficient number, since it is larger than the sum of its proper divisors (1).

1315722637 is an equidigital number, since it uses as much as digits as its factorization.

1315722637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 37.

The square root of 1315722637 is about 36272.8912136874. The cubic root of 1315722637 is about 1095.7751541728.

Adding to 1315722637 its reverse (7362275131), we get a palindrome (8677997768).

The spelling of 1315722637 in words is "one billion, three hundred fifteen million, seven hundred twenty-two thousand, six hundred thirty-seven".