1991262494 has 32 divisors (see below), whose sum is σ = 3327744000. Its totient is φ = 887436000.

The previous prime is 1991262439. The next prime is 1991262499. The reversal of 1991262494 is 4942621991.

It is a super-2 number, since 2×1991262494² = 7930252640022200072, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1991262499) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 399719 + ... + 404669.

It is an arithmetic number, because the mean of its divisors is an integer number (103992000).

Almost surely, 2^1991262494 is an apocalyptic number.

1991262494 is a deficient number, since it is larger than the sum of its proper divisors (1336481506).

1991262494 is a wasteful number, since it uses less digits than its factorization.

1991262494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5496.

The product of its digits is 279936, while the sum is 47.

The square root of 1991262494 is about 44623.5643354495. The cubic root of 1991262494 is about 1258.0836102293.

The spelling of 1991262494 in words is "one billion, nine hundred ninety-one million, two hundred sixty-two thousand, four hundred ninety-four".