991740453 has 16 divisors (see below), whose sum is σ = 1445423616. Its totient is φ = 599849840.

The previous prime is 991740443. The next prime is 991740469. The reversal of 991740453 is 354047199.

It is a cyclic number.

It is not a de Polignac number, because 991740453 - 2¹⁶ = 991674917 is a prime.

It is a super-2 number, since 2×991740453² = 1967098252233290418, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991740413) 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, 13275 + ... + 46472.

It is an arithmetic number, because the mean of its divisors is an integer number (90338976).

Almost surely, 2^991740453 is an apocalyptic number.

It is an amenable number.

991740453 is a deficient number, since it is larger than the sum of its proper divisors (453683163).

991740453 is a wasteful number, since it uses less digits than its factorization.

991740453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60264.

The product of its (nonzero) digits is 136080, while the sum is 42.

The square root of 991740453 is about 31491.9109137569. The cubic root of 991740453 is about 997.2392026791.

The spelling of 991740453 in words is "nine hundred ninety-one million, seven hundred forty thousand, four hundred fifty-three".