2780252531 has 4 divisors (see below), whose sum is σ = 3177431472. Its totient is φ = 2383073592.

The previous prime is 2780252521. The next prime is 2780252543. The reversal of 2780252531 is 1352520872.

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

It is a cyclic number.

It is not a de Polignac number, because 2780252531 - 2⁶ = 2780252467 is a prime.

It is a super-2 number, since 2×2780252531² = 15459608272263811922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2780252491 and 2780252500.

It is not an unprimeable number, because it can be changed into a prime (2780252521) 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, 198589460 + ... + 198589473.

It is an arithmetic number, because the mean of its divisors is an integer number (794357868).

Almost surely, 2^2780252531 is an apocalyptic number.

2780252531 is a deficient number, since it is larger than the sum of its proper divisors (397178941).

2780252531 is an equidigital number, since it uses as much as digits as its factorization.

2780252531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397178940.

The product of its (nonzero) digits is 33600, while the sum is 35.

The square root of 2780252531 is about 52728.1000131808. The cubic root of 2780252531 is about 1406.1384424663.

The spelling of 2780252531 in words is "two billion, seven hundred eighty million, two hundred fifty-two thousand, five hundred thirty-one".