2542561921 has 8 divisors (see below), whose sum is σ = 2691406080. Its totient is φ = 2397795792.

The previous prime is 2542561891. The next prime is 2542561949. The reversal of 2542561921 is 1291652452.

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

It is a cyclic number.

It is not a de Polignac number, because 2542561921 - 2⁷ = 2542561793 is a prime.

It is a super-2 number, since 2×2542561921² = 12929242244238420482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2542561321) 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, 1018225 + ... + 1020718.

It is an arithmetic number, because the mean of its divisors is an integer number (336425760).

Almost surely, 2^2542561921 is an apocalyptic number.

It is an amenable number.

2542561921 is a deficient number, since it is larger than the sum of its proper divisors (148844159).

2542561921 is a wasteful number, since it uses less digits than its factorization.

2542561921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2039015.

The product of its digits is 43200, while the sum is 37.

The square root of 2542561921 is about 50423.8229510615. The cubic root of 2542561921 is about 1364.8675637096.

The spelling of 2542561921 in words is "two billion, five hundred forty-two million, five hundred sixty-one thousand, nine hundred twenty-one".