116261781 has 4 divisors (see below), whose sum is σ = 155015712. Its totient is φ = 77507852.

The previous prime is 116261767. The next prime is 116261833. The reversal of 116261781 is 187162611.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 116261781 - 2⁹ = 116261269 is a prime.

It is a super-2 number, since 2×116261781² = 27033603442583922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (116261731) 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, 19376961 + ... + 19376966.

It is an arithmetic number, because the mean of its divisors is an integer number (38753928).

Almost surely, 2^116261781 is an apocalyptic number.

It is an amenable number.

116261781 is a deficient number, since it is larger than the sum of its proper divisors (38753931).

116261781 is an equidigital number, since it uses as much as digits as its factorization.

116261781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38753930.

The product of its digits is 4032, while the sum is 33.

The square root of 116261781 is about 10782.4756433762. The cubic root of 116261781 is about 488.0664899214.

The spelling of 116261781 in words is "one hundred sixteen million, two hundred sixty-one thousand, seven hundred eighty-one".