31352521145 has 24 divisors (see below), whose sum is σ = 41631899400. Its totient is φ = 22648736000.

The previous prime is 31352521121. The next prime is 31352521147. The reversal of 31352521145 is 54112525313.

It can be written as a sum of positive squares in 4 ways, for example, as 1283573929 + 30068947216 = 35827^2 + 173404^2 .

It is not a de Polignac number, because 31352521145 - 2¹⁴ = 31352504761 is a prime.

It is a super-2 number, since 2×31352521145² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31352521147) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83756 + ... + 264045.

It is an arithmetic number, because the mean of its divisors is an integer number (1734662475).

Almost surely, 2^31352521145 is an apocalyptic number.

It is an amenable number.

31352521145 is a deficient number, since it is larger than the sum of its proper divisors (10279378255).

31352521145 is a wasteful number, since it uses less digits than its factorization.

31352521145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347977 (or 347966 counting only the distinct ones).

The product of its digits is 18000, while the sum is 32.

The spelling of 31352521145 in words is "thirty-one billion, three hundred fifty-two million, five hundred twenty-one thousand, one hundred forty-five".