1249213855 has 8 divisors (see below), whose sum is σ = 1533918672. Its totient is φ = 976129728.

The previous prime is 1249213837. The next prime is 1249213859. The reversal of 1249213855 is 5583129421.

It is a happy number.

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 1249213855 - 2¹³ = 1249205663 is a prime.

It is a super-2 number, since 2×1249213855² = 3121070511047922050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1249213859) 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, 2904934 + ... + 2905363.

It is an arithmetic number, because the mean of its divisors is an integer number (191739834).

Almost surely, 2^1249213855 is an apocalyptic number.

1249213855 is a deficient number, since it is larger than the sum of its proper divisors (284704817).

1249213855 is an equidigital number, since it uses as much as digits as its factorization.

1249213855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5810345.

The product of its digits is 86400, while the sum is 40.

The square root of 1249213855 is about 35344.2195415318. The cubic root of 1249213855 is about 1076.9914712495.

The spelling of 1249213855 in words is "one billion, two hundred forty-nine million, two hundred thirteen thousand, eight hundred fifty-five".