2691023458 has 4 divisors (see below), whose sum is σ = 4036535190. Its totient is φ = 1345511728.

The previous prime is 2691023411. The next prime is 2691023509. The reversal of 2691023458 is 8543201962.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8543201962 = 2 ⋅4271600981.

It can be written as a sum of positive squares in only one way, i.e., 2677752009 + 13271449 = 51747^2 + 3643^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 2691023458.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 672755863 + ... + 672755866.

Almost surely, 2^2691023458 is an apocalyptic number.

2691023458 is a deficient number, since it is larger than the sum of its proper divisors (1345511732).

2691023458 is a wasteful number, since it uses less digits than its factorization.

2691023458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1345511731.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 2691023458 is about 51875.0754987402. The cubic root of 2691023458 is about 1390.9317731642.

The spelling of 2691023458 in words is "two billion, six hundred ninety-one million, twenty-three thousand, four hundred fifty-eight".