781113541 has 16 divisors (see below), whose sum is σ = 914045440. Its totient is φ = 661037760.

The previous prime is 781113499. The next prime is 781113547. The reversal of 781113541 is 145311187.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 781113541 - 2⁷ = 781113413 is a prime.

It is a super-2 number, since 2×781113541² = 1220276727867117362, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (781113547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43350 + ... + 58663.

It is an arithmetic number, because the mean of its divisors is an integer number (57127840).

Almost surely, 2^781113541 is an apocalyptic number.

It is an amenable number.

781113541 is a deficient number, since it is larger than the sum of its proper divisors (132931899).

781113541 is a wasteful number, since it uses less digits than its factorization.

781113541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102076.

The product of its digits is 3360, while the sum is 31.

The square root of 781113541 is about 27948.4085593438. The cubic root of 781113541 is about 920.9542481506.

The spelling of 781113541 in words is "seven hundred eighty-one million, one hundred thirteen thousand, five hundred forty-one".