1318021634 has 4 divisors (see below), whose sum is σ = 1977032454. Its totient is φ = 659010816.

The previous prime is 1318021633. The next prime is 1318021651. The reversal of 1318021634 is 4361208131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 951414025 + 366607609 = 30845^2 + 19147^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1318021597 and 1318021606.

It is not an unprimeable number, because it can be changed into a prime (1318021631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 329505407 + ... + 329505410.

Almost surely, 2^1318021634 is an apocalyptic number.

1318021634 is a deficient number, since it is larger than the sum of its proper divisors (659010820).

1318021634 is an equidigital number, since it uses as much as digits as its factorization.

1318021634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659010819.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 1318021634 is about 36304.5676740545. The cubic root of 1318021634 is about 1096.4130084503.

Adding to 1318021634 its reverse (4361208131), we get a palindrome (5679229765).

The spelling of 1318021634 in words is "one billion, three hundred eighteen million, twenty-one thousand, six hundred thirty-four".