1254998991 has 8 divisors (see below), whose sum is σ = 1696254640. Its totient is φ = 825204672.

The previous prime is 1254998951. The next prime is 1254998999. The reversal of 1254998991 is 1998994521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1254998991 - 2⁷ = 1254998863 is a prime.

It is a super-2 number, since 2×1254998991² = 3150044934822036162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1254998999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2865076 + ... + 2865513.

It is an arithmetic number, because the mean of its divisors is an integer number (212031830).

Almost surely, 2^1254998991 is an apocalyptic number.

1254998991 is a deficient number, since it is larger than the sum of its proper divisors (441255649).

1254998991 is an equidigital number, since it uses as much as digits as its factorization.

1254998991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5730665.

The product of its digits is 2099520, while the sum is 57.

The square root of 1254998991 is about 35425.9649268725. The cubic root of 1254998991 is about 1078.6514349276.

The spelling of 1254998991 in words is "one billion, two hundred fifty-four million, nine hundred ninety-eight thousand, nine hundred ninety-one".