1320212691 has 48 divisors (see below), whose sum is σ = 2242356480. Its totient is φ = 732922560.

The previous prime is 1320212633. The next prime is 1320212711. The reversal of 1320212691 is 1962120231.

It is not a de Polignac number, because 1320212691 - 2¹⁴ = 1320196307 is a prime.

It is a super-2 number, since 2×1320212691² = 3485923098954922962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1320212611) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 316900 + ... + 321038.

It is an arithmetic number, because the mean of its divisors is an integer number (46715760).

Almost surely, 2^1320212691 is an apocalyptic number.

1320212691 is a deficient number, since it is larger than the sum of its proper divisors (922143789).

1320212691 is a wasteful number, since it uses less digits than its factorization.

1320212691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4296 (or 4293 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 1320212691 is about 36334.7311948224. The cubic root of 1320212691 is about 1097.0202249481.

The spelling of 1320212691 in words is "one billion, three hundred twenty million, two hundred twelve thousand, six hundred ninety-one".