1213155001 has 16 divisors (see below), whose sum is σ = 1299063744. Its totient is φ = 1131084864.

The previous prime is 1213154993. The next prime is 1213155019. The reversal of 1213155001 is 1005513121.

It is a cyclic number.

It is not a de Polignac number, because 1213155001 - 2³ = 1213154993 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1213155001.

It is not an unprimeable number, because it can be changed into a prime (1213155101) 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, 77130 + ... + 91516.

It is an arithmetic number, because the mean of its divisors is an integer number (81191484).

Almost surely, 2^1213155001 is an apocalyptic number.

It is an amenable number.

1213155001 is a deficient number, since it is larger than the sum of its proper divisors (85908743).

1213155001 is a wasteful number, since it uses less digits than its factorization.

1213155001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14520.

The product of its (nonzero) digits is 150, while the sum is 19.

The square root of 1213155001 is about 34830.3746893426. The cubic root of 1213155001 is about 1066.5275971796.

Adding to 1213155001 its reverse (1005513121), we get a palindrome (2218668122).

The spelling of 1213155001 in words is "one billion, two hundred thirteen million, one hundred fifty-five thousand, one".