2145251731 has 8 divisors (see below), whose sum is σ = 2461258080. Its totient is φ = 1831630848.

The previous prime is 2145251711. The next prime is 2145251767. The reversal of 2145251731 is 1371525412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2145251731 - 2²⁵ = 2111697299 is a prime.

It is a super-2 number, since 2×2145251731² = 9204209978716992722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2145251693 and 2145251702.

It is not an unprimeable number, because it can be changed into a prime (2145251701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 594436 + ... + 598033.

It is an arithmetic number, because the mean of its divisors is an integer number (307657260).

Almost surely, 2^2145251731 is an apocalyptic number.

2145251731 is a deficient number, since it is larger than the sum of its proper divisors (316006349).

2145251731 is a wasteful number, since it uses less digits than its factorization.

2145251731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192733.

The product of its digits is 8400, while the sum is 31.

The square root of 2145251731 is about 46316.8622749858. The cubic root of 2145251731 is about 1289.7120385627.

The spelling of 2145251731 in words is "two billion, one hundred forty-five million, two hundred fifty-one thousand, seven hundred thirty-one".