15540140031 has 16 divisors (see below), whose sum is σ = 22347241056. Its totient is φ = 9548937216.

The previous prime is 15540140029. The next prime is 15540140041. The reversal of 15540140031 is 13004104551.

It is a happy number.

It is not a de Polignac number, because 15540140031 - 2¹ = 15540140029 is a prime.

It is a super-2 number, since 2×15540140031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 15540139983 and 15540140010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15540140041) 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, 269790 + ... + 322283.

It is an arithmetic number, because the mean of its divisors is an integer number (1396702566).

Almost surely, 2^15540140031 is an apocalyptic number.

15540140031 is a deficient number, since it is larger than the sum of its proper divisors (6807101025).

15540140031 is a wasteful number, since it uses less digits than its factorization.

15540140031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592762.

The product of its (nonzero) digits is 1200, while the sum is 24.

Adding to 15540140031 its reverse (13004104551), we get a palindrome (28544244582).

The spelling of 15540140031 in words is "fifteen billion, five hundred forty million, one hundred forty thousand, thirty-one".