31553204145 has 64 divisors (see below), whose sum is σ = 56195112960. Its totient is φ = 15051916800.

The previous prime is 31553204131. The next prime is 31553204159. The reversal of 31553204145 is 54140235513.

It is an interprime number because it is at equal distance from previous prime (31553204131) and next prime (31553204159).

It is not a de Polignac number, because 31553204145 - 2⁷ = 31553204017 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 318682 + ... + 405788.

It is an arithmetic number, because the mean of its divisors is an integer number (878048640).

Almost surely, 2^31553204145 is an apocalyptic number.

It is an amenable number.

31553204145 is a deficient number, since it is larger than the sum of its proper divisors (24641908815).

31553204145 is a wasteful number, since it uses less digits than its factorization.

31553204145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87206.

The product of its (nonzero) digits is 36000, while the sum is 33.

Adding to 31553204145 its reverse (54140235513), we get a palindrome (85693439658).

The spelling of 31553204145 in words is "thirty-one billion, five hundred fifty-three million, two hundred four thousand, one hundred forty-five".