1220153345531 has 4 divisors (see below), whose sum is σ = 1220165194200. Its totient is φ = 1220141496864.

The previous prime is 1220153345507. The next prime is 1220153345573. The reversal of 1220153345531 is 1355433510221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1220153345531 - 2³⁴ = 1202973476347 is a prime.

It is a super-2 number, since 2×1220153345531² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220153345491 and 1220153345500.

It is not an unprimeable number, because it can be changed into a prime (1220153345581) 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, 5768501 + ... + 5976278.

It is an arithmetic number, because the mean of its divisors is an integer number (305041298550).

Almost surely, 2^{1220153345531} is an apocalyptic number.

1220153345531 is a deficient number, since it is larger than the sum of its proper divisors (11848669).

1220153345531 is a wasteful number, since it uses less digits than its factorization.

1220153345531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11848668.

The product of its (nonzero) digits is 54000, while the sum is 35.

Adding to 1220153345531 its reverse (1355433510221), we get a palindrome (2575586855752).

The spelling of 1220153345531 in words is "one trillion, two hundred twenty billion, one hundred fifty-three million, three hundred forty-five thousand, five hundred thirty-one".