1231555245 has 32 divisors (see below), whose sum is σ = 2007742464. Its totient is φ = 644520000.

The previous prime is 1231555231. The next prime is 1231555271. The reversal of 1231555245 is 5425551321.

It is not a de Polignac number, because 1231555245 - 2⁹ = 1231554733 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 184720 + ... + 191270.

It is an arithmetic number, because the mean of its divisors is an integer number (62741952).

Almost surely, 2^1231555245 is an apocalyptic number.

1231555245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1231555245 is a deficient number, since it is larger than the sum of its proper divisors (776187219).

1231555245 is a wasteful number, since it uses less digits than its factorization.

1231555245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6793.

The product of its digits is 30000, while the sum is 33.

The square root of 1231555245 is about 35093.5214106536. The cubic root of 1231555245 is about 1071.8926658542.

The spelling of 1231555245 in words is "one billion, two hundred thirty-one million, five hundred fifty-five thousand, two hundred forty-five".