2001961558 has 4 divisors (see below), whose sum is σ = 3002942340. Its totient is φ = 1000980778.

The previous prime is 2001961517. The next prime is 2001961567. The reversal of 2001961558 is 8551691002.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500490388 + ... + 500490391.

It is an arithmetic number, because the mean of its divisors is an integer number (750735585).

Almost surely, 2^2001961558 is an apocalyptic number.

2001961558 is a deficient number, since it is larger than the sum of its proper divisors (1000980782).

2001961558 is a wasteful number, since it uses less digits than its factorization.

2001961558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000980781.

The product of its (nonzero) digits is 21600, while the sum is 37.

The square root of 2001961558 is about 44743.2850604423. The cubic root of 2001961558 is about 1260.3328166759.

The spelling of 2001961558 in words is "two billion, one million, nine hundred sixty-one thousand, five hundred fifty-eight".