426961991 has 4 divisors (see below), whose sum is σ = 430033800. Its totient is φ = 423890184.

The previous prime is 426961967. The next prime is 426961999. The reversal of 426961991 is 199169624.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-426961991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (426961999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1535696 + ... + 1535973.

It is an arithmetic number, because the mean of its divisors is an integer number (107508450).

Almost surely, 2^426961991 is an apocalyptic number.

426961991 is a deficient number, since it is larger than the sum of its proper divisors (3071809).

426961991 is a wasteful number, since it uses less digits than its factorization.

426961991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3071808.

The product of its digits is 209952, while the sum is 47.

The square root of 426961991 is about 20663.0586070891. The cubic root of 426961991 is about 753.0024773188.

The spelling of 426961991 in words is "four hundred twenty-six million, nine hundred sixty-one thousand, nine hundred ninety-one".